Feature●The natural comfort and breathability of wool and MFI compatibility for seamless coverage. The Anon MFI Wool Neck Warmer features a wool and synthetic blend for natural warmth and easy-care durability. It wicks moisture for quick-drying, breathable comfort that naturally resists odors. A relaxed fit lets it sit naturally for unrestricted mobility and comfort. Its MFI-compatible for seamless coverage.●Relaxed fit provides unrestricted mobility●Polartec Power Wool is a lightweight, durable blend of polyester and Merino wool that provides all the benefits of wool with added durability, wicking and our best warmth to weight ratio●Compatible with the M3, M2, Relapse, Relapse Junior, and the (all new) Tracker 2.0. The M4, M5 and Sync Goggles require the (gray) XL carrier for optimal fit.●Machine washableDescription The natural comfort and breathability of wool and MFI compatibility for seamless coverage. The Anon MFI Wool Neck Warmer features a wool and synthetic blend for natural warmth and easy-care durability. It wicks moisture for quick-drying, breathable comfort that naturally resists odors. A relaxed fit lets it sit naturally for unrestricted mobility and comfort. Its MFI-compatible for seamless coverage.