Smartwool W CLASSIC THERMAL MERINO BL PTTRN 1/4 ZB New and improved women’s underwear: The Smartwool W CLASSIC THERMAL MERINO BL PTTRN 1/4 ZB brings an innovative design, a better feel and improved performance. It is the best base layer for the cold and is one of the highest-weighted shirts of sustainably sourced 100% Merino wool. It regulates temperature perfectly, the shoulder panels allow for mobility and comfort, and the flat seam design prevents skin abrasion so you can enjoy intense sports such as skiing, hiking, or running. Smartwool W CLASSIC THERMAL MERINO BL PTTRN 1\/4 ZB