Mid-weight merino interlock knit baselayer top. Reduce the bulk under your shell by choosing this mid-weight piece of the Woolies insulating system. Made of 100% sweat-wicking, super durable merino wool, this layer works well on its own or paired with any vest or hoody for reliable warmth. 8'' zip neck with locking pull. Flatlock seams. Set in sleeves. Back length from top of shoulder=25 1/2'' (size M). Material: Wool.