Made from lightweight, four-way-stretch, breathable Italian fabric, the Meridian Thermal Cap is soft and insulated, and it fits well under a helmet. Double-layer, hollow-core microfleece provides extra insulation around the ears and forehead without adding bulk. Crushable and travel friendly with reflective details and a concealed ponytail opening. Features & Specs: Four-way stretch, breathable fabric Hollow-core microfleece insulated lining 2A 1/2" (6.5cm) crushable brim Reflective details Hat/helmet compatible Concealed ponytail opening Crushable design is travel-friendly UPF 50+ sun rating Italian-sourced fabric Weight: 1.9 ounces/54 grams Care & Content: Fabric content: BODY: 57% NYLON, 28% POLYESTER,15% SPANDEX, EXCLUSIVE OF DECORATION Washing and care instructions: Hand wash cold, line dry. Do not bleach, iron, or dry clean. Packing instructions: Crushable