SIMIYA Thermal Underwear with Inner Fleece Ultralight Black M Product Description: SIMIYA thermal underwear is a reliable protection against the cold, created for men who value comfort, functionality and style. Made of high-quality microfiber (92%) and spandex (8%), it provides a perfect fit to the figure while providing complete freedom of movement. The inner layer of soft fleece effectively retains heat, thanks to which the set – a long-sleeved T-shirt and trousers – works well even on the coldest days.