The Northern Sky Sizing Chart - Thermal Longsleeves
| S | M | L | XL | XXL | |
| HPS | 26.5" | 27.5" | 28.5" | 29.5" | 30.5" |
| CHEST: 1" BELOW AH | 18.5" | 19.5" | 20.5" | 21.5" | 22.5" |
| S | M | L | XL | XXL | |
| HPS | 26.5" | 27.5" | 28.5" | 29.5" | 30.5" |
| CHEST: 1" BELOW AH | 18.5" | 19.5" | 20.5" | 21.5" | 22.5" |