Thank you for viewing. This is a Patagonia Capilene Thermal Weight one-piece suit. M's CAP4 EW ONE PIECE Suit. For winter sports and alpine climbing. It has thumbholes. It has been used a few times and is in good condition. It is a well-regarded Patagonia base layer, and features include the ability to protect your back, which easily releases heat, and the convenience of being able to use the restroom without taking off the suit. It may also be suitable for work in cold regions. Thank you very much.