The Women's PolarmaxA(R) Merino Wool Crewneck Baselayer combines naturally insulating merino wool with Acclimate Dry fibers for a baselayer that locks in the warmth without trapping in excess moisture. It's enhanced with spandex and 4-way stretch for a truly comfortable fit that moves with you every step of the way. Naturally insulating for midweight warmth 67% polyester, 28% merino wool, 5% spandex 4-way stretch moves better in every direction Odor blocking Acclimate Dry hydrophobic yarns transport moisture quickly away from the skin Relaxed fit Order today!