Breathable Thermal Knit Fabric 77% Lyocell 19% Wool 2x2 Rib 220GSM Winter Underlayer Fabric for Base Layer Tops Most wool base layers fail on breathability, not on warmth — the wearer overheats indoors and the fabric has nowhere to put the moisture. This 220gsm lyocell wool rib is built the other way round: lyocell does the moisture transport, wool does the humidity buffering, and the open 2x2 rib structure leaves air channels between the wales. The result is a winter