| Name | Size | Shoulders | Cummerbund | Sizing notes |
| T3000 | xsmall | 13" - 16" | 24" - 34" | This size is suitable for most women and children. |
| T3000 | small | 14" - 17.5" | 24" - 34" | This size is suitable for larger women and larger children |
| T3000 | medium | 15'' - 18'' | 24" - 34" | This size is suitable for most women that have a large bust size or for shorter men or for those people with a shorter than average torso length. |
| T3000 | large | 17" - 22" | 32"-42" | This size is suitable for most men (If you are a "true", medium-sized man, you will take a size Large). This is by far the most popular size because it adjusts up for the bigger men who are still too small for the Extra Large. |
| T3000 | xlarge | 18.5" - 23.5" | 32"-42" | This size is suitable for larger man who may have a muscular build |
| T3000 | xxlarge | 22.5" and greater | 42" and greater | This size is suitable for divers taller than 75 inches (190cm), 250lbs (110kg) |