Mid-weight merino interlock knit baselayer top. This mid-weight 100% merino wool baselayer will quickly move to the top of your gear pile because of its soft interlock knit, supreme breathability, and ability to still look (and smell) good after many, many uses. The newest weight in the popular Woolies line, this crew is a welcome addition to any insulating system. Flatlock stitching. Set in sleeves. Tag-free label. Back length from top of shoulder=25 1/2" (size M). Material: Wool.