David Archy Men's Free-Cutting Knit Long Sleeve Top And Bottom Thermal Underwear Set 65% Polyacrylonitrile / 27% Modal (Rayon)/ 8% Spandex FREE-CUTTING. Its magic and most special technology allows you to decide the length all by yourself since you can cut both the top and bottom freely according to the length you favor FREE-STRETCH. Highly elastic fiber added enables your body stretch and move freely and easily without any constraint WARMTH. With elaborately selected fabric and scientific component proportion, your body will be embraced by softness and warmth SLIM FIT. Show off your amazing figure with the slim fit style and that definitely make you look sexy while you can choose one size up if you prefer loose and relaxed wearing feeling