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| XS | S | ST | MS | |
| Ht. | 5'4 - 5'6 | 5'6 - 5'8 | 5'9 - 6'0 | 5'7 - 5'9 |
| Lbs | 168 - 173 | 175 - 183 | 170 - 175 | 173 - 178 |
| Chest | 37" | 37" | 38" | 39" |
| Waist | 30" | 30" | 31" | 32" |
| M | MT | MLS | ML | |
| Ht. | 5'8 - 5'10 | 5'11 - 6'1 | 5'6 - 5'8 | 5'9 - 5'11 |
| Lbs | 125 - 135 | 180 -1 85 | 168 - 173 | 175 - 180 |
| Chest | 35.5" | 39" | 40" | 40" |
| Waist | 29" | 32" | 33" | 33" |
| LS | L | LT | XLS | |
| Ht. | 5'7 - 5'9 | 5'10 - 6'0 | 6'1 - 6'3 | 5'8 - 5'10 |
| Lbs | 170 - 175 | 178 - 183 | 185 - 191 | 173 - 178 |
| Chest | 41" | 41" | 41" | 43" |
| Waist | 34" | 34" | 34" | 36" |
| XL | XLT | 2XLS | 2XL | |
| Ht. | 5'11 - 6'2 | 6'3 - 6'6 | 5'9 - 6' | 5'9 - 6' |
| Lbs | 180 - 188 | 191 - 198 | 175 - 183 | 183 - 191 |
| Chest | 43" | 43" | 45" | 45" |
| Waist | 36" | 38" | 38" | 38" |
| 3XLS | 3XL | 4XL | |
| Ht. | 5'10 - 6'1 | 6'1 - 6'6 | 6'1 - 6'6 |
| Lbs | 178 - 185 | 185 - 198 | 185 - 198 |
| Chest | 49" | 49" | 53" |
| Waist | 42" | 42 " | 46" |
Jamie O'Brien's RB1 2MM short sleeve full keeps you warm without restriction. It comes fully loaded with Ninja Neoprene fused together with our Triple glued and blindstitched Sizzle Seam seal to ensure long-term warmth and flexibility.
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