Product details:

Layer on the warmth without the bulk. Made of 100% Merino wool from only the finest sheep families in all of New Zealand. Gently sheared, then carefully dyed and printed (the wool, not the sheep) for a next-to-skin top that'll carry you from dusk til dawn. It wicks, it warms, and it never retains odor. Machine washable. By Icebreaker. XS(2), S(4-6), M(8-10), L(12-14), XL(16).