The Spencer Thermal is inspired by Swiss military thermals, knit on a hand-flat manual machine. The body features a tuck stitch of the body which mimics the texture of a waffle knit, while the sleeves have a rib construction from the cuffs all the way up to the shoulder. This sweater is substantial and densely woven, yet soft and comfortable by itself. The fabric is knit with natural undyed charcoal alpaca yarn combined with plant based indigo Peruvian pima cotton yarns.