NOTE: It is highly recommended that Nomex underwear be worn in conjunction with all driving suits, especially single-layer (3/2A-1).
| One Piece Suit Sizing Chart | Suit Size | Chest | Waist | Hips | Inseam | Back of Neck to Waist |
| Small | 36" - 38" | 30 32 | 35 37 | 28 - 31" | 18 19" |
| Medium | 38" - 42" | 32 36 | 37 39 | 30 - 31" | 18 - 19" |
| Large | 42" - 46" | 38 40 | 41 44 | 30 - 31" | 18 19" |
| X-Large | 46" - 50" | 41 44 | 45 47 | 30 - 31" | 20 - 21" |
| Two Piece Suit Sizing Chart | Jacket | Chest | Pants | Waist | Hips | Thigh | Inseam |
| Small | 34" - 36" | Small | 28" - 31" | 38" | 22" | 32" | |
| Medium | 38" - 40" | Medium | 32" - 35" | 40" | 24" | 32" | |
| Large | 42" - 44" | Large | 36" - 39" | 44" | 26" | 32" | |
| X-Large | 46" - 48" | X-Large | 40" - 44" | 48" | 28" | 32" | |
| XX-Large | 50" - 52" | ||||||