You can find the waist measurements for all of our underwear below.
| S | M | L | XL | XXL | |
| Waist | 28-30" | 31-34" | 34-36" | 36-40" | 42"-46" |
The waists on our underwear are designed to accommodate a range of sizes, but if you fall in between sizes and prefer a looser fit, the larger option may feel and fit better.
| Boxers | Long Underwear | |
| 18-Hour Jersey Knit | AIRKNITX Performance Tights | |
| 24/7 Woven Boxers | WARMKNIT Long Underwear | |
| Tech Cashmere Long Underwear |
18-Hour Jersey Boxer Briefs
The 18-Hour Jersey fabric fits close to the skin without being constricting.
The inseam of 18-Hour Jersey Boxer Briefs is 6" in all sizes, but since we use a gusset instead of a traditional inseam, the way we measure it may be different from other brands.
18-Hour Jersey Trunks
The 18-Hour Jersey fabric fits close to the skin without being constricting.
The inseam of 18-Hour Jersey Trunks is 3" in all sizes, but since we use a gusset instead of a traditional inseam, the way we measure it may be different from other brands.
18-Hour Jersey Briefs
The 18-Hour Jersey fabric fits close to the skin without being constricting.
18-Hour Knit Boxers
The 18-Hour Knit Boxers are made with the same fabric as our 18-Hour Jersey underwear, but with a looser fit. They have a button fly at the crotch and a covered waistband.
You can find the outseams of the 18-Hour Jersey Knit Boxers below. The outseam is the measurement along the outside of the leg, from the top of the waistband to the leg opening.
| S | M | L | XL | XXL | |
| Outseam | 13.75" | 14.5" | 15.25" | 16" | 16.75" |
Silver Boxer Briefs
The Silver fabric is mostly cotton, so while it's meant to fit close to the skin, it's not as close-fitting as our other fabrics.
The inseam of Silver Boxer Briefs is 6" in all sizes, but since we use a gusset instead of a traditional inseam, the way we measure it may be different from other brands.
Silver Trunks
The Silver fabric is mostly cotton, so while it's meant to fit close to the skin, it's not as close-fitting as our other fabrics.
The inseam of Silver Trunks is 3.75" in all sizes, but since we use a gusset instead of a traditional inseam, the way we measure it may be different from other brands.
Silver Brief
The Silver fabric is mostly cotton, so while it's meant to fit close to the skin, it's not as close-fitting as our other fabrics.
Silver HD Boxer Briefs
The limited-edition version of our Silver Underwear— so while it's meant to fit close to the skin, it's not as close-fitting as our other fabrics.
The inseam of Silver HD Boxer Briefs is 6" in all sizes, but since we use a gusset instead of a traditional inseam, the way we measure it may be different from other brands.
Silver HD Trunks
The limited-edition version of our Silver Underwear— so while it's meant to fit close to the skin, it's not as close-fitting as our other fabrics.
The inseam of Silver HD Boxer Briefs is 3.75" in all sizes, but since we use a gusset instead of a traditional inseam, the way we measure it may be different from other brands.
Silver HD Briefs
The limited-edition version of our Silver Underwear— so while it's meant to fit close to the skin, it's not as close-fitting as our other fabrics.
AIRKNITX/AIRKNITX 8" Boxer Briefs
The AIRKNITX fabric is a microfiber blend that's ideal for exercise. It's flyless and close-fitting for extra support, with four-way stretch that moves with you. Because of the elasticity, if you're on the lower end of a size range, you can comfortably size down.
The inseam of AIRKNITX Boxer Briefs is 5" in all sizes, but since we use a gusset instead of a traditional inseam, there may be some variation in the actual fit.
The AIRKNITX 8" Boxers Briefs are a modified version that adds 3" to the inseam to wick away moisture and prevent riding up while exercising.
AIRKNITX Trunks
The AIRKNITX fabric is a microfiber blend that's ideal for exercise. It's flyless and close-fitting for extra support, with four-way stretch that moves with you. Because of the elasticity, if you're on the lower end of a size range, you can comfortably size down.
The inseam of AIRKNITX Trunks is 3" in all sizes, but since we use a gusset instead of a traditional inseam, there may be some variation in the actual fit.
AIRKNITX Briefs
The AIRKNITX fabric is a microfiber blend that's ideal for exercise. It's flyless and close-fitting for extra support, with four-way stretch that moves with you. Because of the elasticity, if you're on the lower end of a size range, you can comfortably size down.
AIRKNITX Performance Tights
The AIRKNITX fabric is a microfiber blend that's ideal for exercise. It's flyless and close-fitting for extra support, with four-way stretch that moves with you.
Since the Performance Tights are full length, different sizes have different inseams. You can find the inseams below:
| S | M | L | XL | XXL | |
| Inseam | 28" | 28.5" | 29" | 29.5" | 30" |
AIRKNITX HD/ AIRKNITx HD 8" Boxer Briefs
The limited-edition version of our AIRKNITx Underwear - It's flyless and close-fitting for extra support, with four-way stretch that moves with you. Because of the elasticity, if you're on the lower end of a size range, you can comfortably size down.
The inseam of AIRKNITX HD Boxer Briefs is 5" in all sizes, but since we use a gusset instead of a traditional inseam, there may be some variation in the actual fit.
The AIRKNITX HD 8" Boxers Briefs are a modified version that adds 3" to the inseam to wick away moisture and prevent riding up while exercising.
AIRKNITX HD Trunks
The limited-edition version of our AIRKNITx Underwear - It's flyless and close-fitting for extra support, with four-way stretch that moves with you. Because of the elasticity, if you're on the lower end of a size range, you can comfortably size down.
The inseam of AIRKNITX HD Boxer Briefs is 3" in all sizes, but since we use a gusset instead of a traditional inseam, there may be some variation in the actual fit.
AIRKNITX HD Briefs
The limited-edition version of our AIRKNITx Underwear - It's flyless and close-fitting for extra support, with four-way stretch that moves with you. Because of the elasticity, if you're on the lower end of a size range, you can comfortably size down.
Stealth/Stealth 8" Boxer Briefs
The Stealth fabric is meant to be a second skin feel so it sits very close the skin and fits in between mid-rise and high-rise.
The inseam of Stealth Boxer Briefs is 6" in all sizes.
The Stealth 8" Boxers Briefs are a modified version that adds 3" to the inseam to prevent riding up while exercising.
24/7 Woven Boxers
Our 24/7 Woven Boxers are tailored to be less bulky but still looser-fitting.
The 24/7 Woven Boxers have a 4" inseam in every size.
WARMKNIT Long Underwear
The WARMKNIT fabric is our reinvented thermal long underwear. They are medium weight for warmth and bulk-free layering.
Since the WARMKNIT Long Underwear are full length, different sizes have different inseams. You can find the inseams below:
| S | M | L | XL | XXL | |
| Inseam | 27" | 27.5" | 28" | 28.5" | 29" |
Tech Cashmere Long Underwear
The Tech Cashmere Long Underwear is a combination of two of the finest wools. The fit is true to size.
Since the Tech Cashmere Long Underwear are full length, different sizes have different inseams. You can find the inseams below:
| S | M | L | XL | XXL | |
| Inseam | 31" | 32" | 32.5" | 33" | 34" |
*Discontinued Product - No Longer Available*
The 18-Hour Mesh fabric is the same blend of materials as our 18-Hour Jersey, but in the pique weave fabrication that forms the mesh cool zones on our other underwear. It's flyless for extra support.
*Discontinued Product - No Longer Available*
Our Woven Boxers are tailored to be less bulky but still looser-fitting.
You can find the outseams of the Woven Boxers below. The outseam is the measurement along the outside of the leg, from the top of the waistband to the leg opening.
| S | M | L | XL | XXL | |
| Outseam | 13.75" | 14.5" | 15.25" | 16" | 16.75" |
*Discontinued Product - No Longer Available*
The Merino Long Underwear is made with a blend of Merino wool and a natural cellulose fiber that provides stretch and durability. The fabric fits close to the skin.
Since the Long Underwear are full length, different sizes have different inseams. You can find the inseams below:
| S | M | L | XL | XXL |
| 31.5" | 32" | 32.5" | 33" | 33.5" |