Portal Brand Running, Cycling, & Outdoor Apparel Out & Back PORTAL Drift Merino Wool Blend Beanie for Men MR PORTER Portal Brand Running, Cycling, & Outdoor Apparel Out & Back Portal Outsiders Store UK Drift Collection Portal Outsiders Store UK. An indispensable, discipline spanning t shirt, the Drift Merino Tee from Portal is deserving of the 'essential' descriptor. This is thanks to the majority merino wool composite fabric, a natural fibre that's long been touted for its exemplary moisture wicking, odour repelling and quick drying properties, performing better than most if not all synthetic fabrics. It also features gusseted underarms and raglan sleeves for a full range of movement, as well as flatlock stitching to reduce chafing.