It's a Limited Edition take on the comfiest underwear you will ever own, made with TBo's ultra-soft Bamboo Viscose fabric. They're ManShaped, breathable, temperature regulating and were designed by guys like you, who weighed in on every detail to co-create this Limited Edition pair of underwear. Only a small number were made, so get 'em while you can.95% Bamboo Viscose & 5% SpandexNew Size chart! ( Do you own the previous generation of ballsy? Take one size smaller)