The men's functional undershirt AMBOS is made of quick-drying, vapor-permeable, flexible, warm and structured material with COOL-DRY, which excels in quick moisture wicking, the ability to absorb odors and keep the body warm, has an anatomically shaped, snug fit and elastic flat seams only for connecting the sleeves. Material composition: 65% polyester, 27% nylon, 8% elastane.