The Step One Men's Trunk in Butter Nuts is anti-chafe bamboo underwear with a four-inch inseam, a sleeker cut designed for men with thinner legs. A hidden elastic 3D Comfort Pouch surrounds and supports everything, keeping it in place all day. UltraGlyde ride-up resistant panels on the inner thigh reduce friction and stop the legs riding up, whatever you are doing. The fabric is 95% viscose from bamboo and 5% spandex, giving a super soft feel with the right balance of stretch and support. Bamboo viscose wicks away moisture to keep you fresh and dry, is breathable and hypoallergenic, and is produced in a closed-loop system. Choose the Trunk if you have thinner legs; the Boxer Brief has a longer six-inch leg for thicker legs. Sizing is fitted, so if you are between sizes, size up. Machine washable.
The Step One Men's Trunk in Butter Nuts is anti-chafe bamboo underwear with a four-inch inseam, a sleeker cut designed for men with thinner legs. A hidden elastic 3D Comfort Pouch surrounds and supports everything, keeping it in place all day. UltraGlyde ride-up resistant panels on the inner thigh reduce friction and stop the legs riding up, whatever you are doing. The fabric is 95% viscose from bamboo and 5% spandex, giving a super soft feel with the right balance of stretch and support. Bamboo viscose wicks away moisture to keep you fresh and dry, is breathable and hypoallergenic, and is produced in a closed-loop system. Choose the Trunk if you have thinner legs; the Boxer Brief has a longer six-inch leg for thicker legs. Sizing is fitted, so if you are between sizes, size up. Machine washable.
in 1 offers
The lowest price for STEP ONE Junior Underwear Trunk Briefs Underwear for Boys Butter Nuts right now is $19.00 at Step One.
The all-time low was $19.00 on 2 Nov 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 2 Nov 2026.
STEP ONE Junior Underwear Trunk Briefs Underwear for Boys Butter Nuts
The Step One Men's Trunk in Butter Nuts is anti-chafe bamboo underwear with a four-inch inseam, a sleeker cut designed for men with thinner legs. A hidden elastic 3D Comfort Pouch surrounds and supports everything, keeping it in place all day. UltraGlyde ride-up resistant panels on the inner thigh reduce friction and stop the legs riding up, whatever you are doing. The fabric is 95% viscose from bamboo and 5% spandex, giving a super soft feel with the right balance of stretch and support. Bamboo viscose wicks away moisture to keep you fresh and dry, is breathable and hypoallergenic, and is produced in a closed-loop system. Choose the Trunk if you have thinner legs; the Boxer Brief has a longer six-inch leg for thicker legs. Sizing is fitted, so if you are between sizes, size up. Machine washable.
The Step One Men's Trunk in Butter Nuts is anti-chafe bamboo underwear with a four-inch inseam, a sleeker cut designed for men with thinner legs. A hidden elastic 3D Comfort Pouch surrounds and supports everything, keeping it in place all day. UltraGlyde ride-up resistant panels on the inner thigh reduce friction and stop the legs riding up, whatever you are doing. The fabric is 95% viscose from bamboo and 5% spandex, giving a super soft feel with the right balance of stretch and support. Bamboo viscose wicks away moisture to keep you fresh and dry, is breathable and hypoallergenic, and is produced in a closed-loop system. Choose the Trunk if you have thinner legs; the Boxer Brief has a longer six-inch leg for thicker legs. Sizing is fitted, so if you are between sizes, size up. Machine washable.
Last updated at 02/11/2026 05:59:48
Junior Trunk | Butter Nuts | Boys Anti-Chafe Underwear | Bamboo Viscose Fabric | No Ride-Up | Boys Underwear | Ages 4-5
Free delivery between 4–16 Nov
Junior Trunk | Butter Nuts | Boys Anti-Chafe Underwear | Bamboo Viscose Fabric | No Ride-Up | Boys Underwear | Ages 4-5
Free delivery between 4–16 Nov
