Excellent condition! Rare!! Not sure of size but measures 17” PTP. Maybe a 6? Powered by seamless technology, this cozy, sweat-wicking layer was designed to be worn under your raincoat on wet commutes or under your ski jacket when hitting the slopes. skip-the-chafe, seamless construction Minimal seams to reduce chafe Sweat-wicking Four-way stretch Cozy and warm features Thumbholes keep your sleeves in place This fabric was treated with No-Stink Zinc™ to inhibit the growth of odour-causing bacteria