150gsm jersey knit utilizes yarns combing the warmth of Merino wool with the added softness of plant-derived TENCEL and recycled nylon for durability |Merino yarns meet the RWS (Responsible Wool Standard) and are sourced from humanely raised, non-mulesed sheep |Betaspun technology tightly twists fibres to create a light, soft, durable yarn that regulates temperature and resists abrasion and pilling |Low-profile design fits under a helmet |Merrow seam construction minimizes bulk and enhances comfort |Reversible design features a large Bird graphic on one side and a small Wordmark on the other