These long unisex underpants are made of innovative microfibres and promote the blood flow, regulate the temperature and, thus, prevent the production of sweat thanks to their high portion of silver threads. Perfect for all those obsessed with working out or being active in their spare time. Outer material: 100% cotton; inner mat.: 66% cotton, 22% polyester, and 12% silver fibres. Fibre/Yarn contains a Biocidal Product. Contains “silver sodium zirconium hydrogenphosphate – CAS-# 7440-22-4” built into the fiber polymer to counter the settlement and growth of micro-organisms and the development of odour in/on the treated.