Natural Fibre Winter Essential. The BaaBaa Merino Skullcap II combines the insulative and odour controlling properties of merino with the excellent moisture management properties of synthetic fibres, keeping your head warm and comfortable throughout your ride. It features a merino blend for soft, itch-free comfort, a helmet-compatible fit, and is naturally odour resistant with a high warmth-to-weight ratio even when wet. Composition: 93% Wool, 7% Elastane. One Size fits all.