This kit features the base model of our Foundation Rash Guard and AirFlex shorts. Please use the size charts below to determine your correct size.
This kit features the base model of our Foundation Rash Guard and AirFlex shorts. Please use the size charts below to determine your correct size.
All of our rash guards follow the same size chart. Our rash guards are designed to fit tight. If you're not sure about the best size or would like a looser fit, please size up.
| Size | Weight |
| XS | 95lbs to 115lbs |
| S | 105lbs to 130lbs |
| M | 125lbs to 165lbs |
| L | 155lbs to 175lbs |
| XL | 170lbs to 200lbs |
| 2XL | 185lbs to 230lbs |
| 3XL | 220lbs to 250lbs |
| 4XL | 250lbs and up |
Please find your waist size below to select the best fit.
| Size | Waist |
| XS | 28" |
| S | 30" |
| M | 32" |
| L | 34" |
| XL | 36" |
| XXL | 38" |
| XXXL | 40" |
Not sure if you're choosing the right size? We get it, Jiu Jitsu gear sizing can be tricky. That's why we offer totally free pre-paid returns.
$99.99 $109.98 Size Guide
This kit features the base model of our Foundation Rash Guard and AirFlex shorts. Please use the size charts below to determine your correct size.
All of our rash guards follow the same size chart. Our rash guards are designed to fit tight. If you're not sure about the best size or would like a looser fit, please size up.
| Size | Weight |
| XS | 95lbs to 115lbs |
| S | 105lbs to 130lbs |
| M | 125lbs to 165lbs |
| L | 155lbs to 175lbs |
| XL | 170lbs to 200lbs |
| 2XL | 185lbs to 230lbs |
| 3XL | 220lbs to 250lbs |
| 4XL | 250lbs and up |
Please find your waist size below to select the best fit.
| Size | Waist |
| XS | 28" |
| S | 30" |
| M | 32" |
| L | 34" |
| XL | 36" |
| XXL | 38" |
| XXXL | 40" |
Not sure if you're choosing the right size? We get it, Jiu Jitsu gear sizing can be tricky. That's why we offer totally free pre-paid returns.
New drop! Our officially licensed Gold BJJ x C4 Foundation no-gi kit is here.
Save with this bundle including the C4 Rash Guard and C4 Shorts.
For every set sold, we donate $10 to the C4 Foundation.
Ships Today from San Diego • Free Returns
The C4 Foundation provides resources and support available nowhere else to active-duty Navy SEALs and their families.
Through neuroscience-based programs recognized by Naval Special Warfare, the C4 Foundation reduces stress, strengthens family connections, and builds resilience, optimism, and gratitude across the SEAL community.
We're proud to partner with them with our line of officially licensed no-gi gear. For each piece sold, we donate $5 to the foundation ($10 for the full kit on this page).
