Originally developed in the early ’50s by the U.S. Navy as an insulating baselayer, the waffle-knit thermal has become a modern wardrobe staple. Relwen paid close attention to that military heritage when developing the Bi-Waffle Thermal Mock. Knit from 100% cotton, it provides lightweight, breathable warmth when temperatures dip. The mock neck provides extra warmth, and its three-button placket is bound and trapunto-stitched for added durability—a detail found on vintage military garments.