A youth medium polo fits a 28-30 inch chest (71-76 cm) in Port & Company KP55Y and a 28-30 inch chest in Sport-Tek YST550.
Method: compiled 2026-10-06 from 3 sources, each named beside its row: Port & Company KP55Y spec sheet (https://www.sanmar.com/p/5729_Royal/specSheetMeasurements, fetched live 2026-10-06); Sport-Tek YST550 spec sheet (https://www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, fetched live 2026-10-06); Port Authority Y100 spec sheet (https://www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, fetched live 2026-10-06). Where a source gives inches only, cm is converted at 2.54 cm per inch and rounded to the nearest cm. Values a source publishes outside a plausible garment range are left out.
What chest does each polo size fit?
Body chest, measured around the wearer at the fullest part.
| Size | Brand and style | Measurement | Inches | cm | Source |
|---|---|---|---|---|---|
| Youth XS | Port & Company KP55Y | Body chest it fits | 25-26 | 64-66 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth XS | Port Authority Y100 | Body chest it fits | 25-26 | 64-66 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth XS | Sport-Tek YST550 | Body chest it fits | 22-24 | 56-61 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth S | Port & Company KP55Y | Body chest it fits | 26-28 | 66-71 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth S | Port Authority Y100 | Body chest it fits | 26-28 | 66-71 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth S | Sport-Tek YST550 | Body chest it fits | 25-27 | 64-69 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth M | Port & Company KP55Y | Body chest it fits | 28-30 | 71-76 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth M | Port Authority Y100 | Body chest it fits | 28-30 | 71-76 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth M | Sport-Tek YST550 | Body chest it fits | 28-30 | 71-76 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth L | Port & Company KP55Y | Body chest it fits | 30-32 | 76-81 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth L | Port Authority Y100 | Body chest it fits | 30-32 | 76-81 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth L | Sport-Tek YST550 | Body chest it fits | 30-32 | 76-81 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth XL | Port & Company KP55Y | Body chest it fits | 32-35 | 81-89 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth XL | Port Authority Y100 | Body chest it fits | 32-35 | 81-89 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
| Youth XL | Sport-Tek YST550 | Body chest it fits | 32-34 | 81-86 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Size Chart 'Chest' row, fetched 2026-10-06 |
How wide and long is each polo?
Garment measurements from the spec sheets: chest laid flat and body length.
| Size | Brand and style | Measurement | Inches | cm | Source |
|---|---|---|---|---|---|
| Youth XS | Port & Company KP55Y | Chest, laid flat | 15.5 | 39 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth XS | Port Authority Y100 | Chest, laid flat | 14.5 | 37 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth XS | Sport-Tek YST550 | Chest, laid flat | 14 | 36 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth XS | Port & Company KP55Y | Body length | 19.5 | 50 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth XS | Port Authority Y100 | Body length | 19 | 48 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth XS | Sport-Tek YST550 | Body length | 19 | 48 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth S | Port & Company KP55Y | Chest, laid flat | 16 | 41 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth S | Port Authority Y100 | Chest, laid flat | 16 | 41 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth S | Sport-Tek YST550 | Chest, laid flat | 15.5 | 39 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth S | Port & Company KP55Y | Body length | 21 | 53 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth S | Port Authority Y100 | Body length | 21 | 53 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth S | Sport-Tek YST550 | Body length | 21 | 53 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth M | Port & Company KP55Y | Chest, laid flat | 17 | 43 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth M | Port Authority Y100 | Chest, laid flat | 17.5 | 44 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth M | Sport-Tek YST550 | Chest, laid flat | 17 | 43 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth M | Port & Company KP55Y | Body length | 22.5 | 57 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth M | Port Authority Y100 | Body length | 23 | 58 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth M | Sport-Tek YST550 | Body length | 23 | 58 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth L | Port & Company KP55Y | Chest, laid flat | 18 | 46 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth L | Port Authority Y100 | Chest, laid flat | 18.5 | 47 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth L | Sport-Tek YST550 | Chest, laid flat | 18 | 46 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth L | Port & Company KP55Y | Body length | 24.5 | 62 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth L | Port Authority Y100 | Body length | 25 | 64 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth L | Sport-Tek YST550 | Body length | 25 | 64 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth XL | Port & Company KP55Y | Chest, laid flat | 19.5 | 50 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth XL | Port Authority Y100 | Chest, laid flat | 20 | 51 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth XL | Sport-Tek YST550 | Chest, laid flat | 19.5 | 50 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Chest' row, fetched 2026-10-06 |
| Youth XL | Port & Company KP55Y | Body length | 26.5 | 67 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth XL | Port Authority Y100 | Body length | 27 | 69 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
| Youth XL | Sport-Tek YST550 | Body length | 27 | 69 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Body Length at Back' row, fetched 2026-10-06 |
How long are the sleeves on each polo?
Sleeve length from the spec sheets; the measurement column says where each brand measures from.
| Size | Brand and style | Measurement | Inches | cm | Source |
|---|---|---|---|---|---|
| Youth XS | Port & Company KP55Y | Sleeve length | 14 | 36 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Sleeve Length' row, fetched 2026-10-06 |
| Youth XS | Port Authority Y100 | Sleeve length | 12 | 30 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth XS | Sport-Tek YST550 | Sleeve length | 12 | 30 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth S | Port & Company KP55Y | Sleeve length | 14.5 | 37 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Sleeve Length' row, fetched 2026-10-06 |
| Youth S | Port Authority Y100 | Sleeve length | 13.25 | 34 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth S | Sport-Tek YST550 | Sleeve length | 13.25 | 34 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth M | Port & Company KP55Y | Sleeve length | 15 | 38 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Sleeve Length' row, fetched 2026-10-06 |
| Youth M | Port Authority Y100 | Sleeve length | 14.5 | 37 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth M | Sport-Tek YST550 | Sleeve length | 14.5 | 37 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth L | Port & Company KP55Y | Sleeve length | 15.75 | 40 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Sleeve Length' row, fetched 2026-10-06 |
| Youth L | Port Authority Y100 | Sleeve length | 15.75 | 40 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth L | Sport-Tek YST550 | Sleeve length | 15.75 | 40 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth XL | Port & Company KP55Y | Sleeve length | 16.5 | 42 (converted) | www.sanmar.com/p/5729_Royal/specSheetMeasurements, Product Measurements 'Sleeve Length' row, fetched 2026-10-06 |
| Youth XL | Port Authority Y100 | Sleeve length | 17.25 | 44 (converted) | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
| Youth XL | Sport-Tek YST550 | Sleeve length | 17.25 | 44 (converted) | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, Product Measurements 'Sleeve Length from Center Back' row, fetched 2026-10-06 |
What number sizes match youth letter sizes?
The number sizes the spec sheets print under each letter.
| Size | Brand and style | Numeric size | Source |
|---|---|---|---|
| Youth XS | Port & Company KP55Y | 4 | www.sanmar.com/p/5729_Royal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth XS | Port Authority Y100 | 4 | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth XS | Sport-Tek YST550 | 4/5 | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth S | Port & Company KP55Y | 6/8 | www.sanmar.com/p/5729_Royal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth S | Port Authority Y100 | 6/8 | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth S | Sport-Tek YST550 | 6/8 | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth M | Port & Company KP55Y | 10/12 | www.sanmar.com/p/5729_Royal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth M | Port Authority Y100 | 10/12 | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth M | Sport-Tek YST550 | 10/12 | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth L | Port & Company KP55Y | 14/16 | www.sanmar.com/p/5729_Royal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth L | Port Authority Y100 | 14/16 | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth L | Sport-Tek YST550 | 14/16 | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth XL | Port & Company KP55Y | 18/20 | www.sanmar.com/p/5729_Royal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth XL | Port Authority Y100 | 18/20 | www.sanmar.com/p/8003_TrueRoyal/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |
| Youth XL | Sport-Tek YST550 | 18/20 | www.sanmar.com/p/75476_DeepRed/specSheetMeasurements, 'Size' row, fetched 2026-10-06 |