Rockbros M015 Winter Bicycle Cap Under Helmet Size 54-61 cm - Black The Rockbros M015 Winter Cycling Cap is designed for riding in cold conditions. The double-layer construction helps keep you warm while remaining lightweight and comfortable during intense exercise. The outer layer protects against wind and moisture, while the soft inner layer supports thermal insulation and wearing comfort. The extended design protects the ears more effectively from the cold, and the elastic material adapts well to the head. The hat fits easily under a bicycle helmet, helping to reduce sweat and improve comfort while riding. ~ Specification: Brand: Rockbros Model: Rockbros M015 Size: 54 - 61cm Material: Nylon, Polyester, Spandex Color: Black ~ Key Benefits of Rockbros Cap: Double-layer Construction: Helps keep you warm and increases comfort when riding in low temperatures. Nylon outer material: lightweight and windproof, supports protection from the cold. Heat-insulating inner layer: helps retain temperature and reduce heat loss. Extended ear cover: protects sensitive areas from cold and wind more effectively. Flexible design: adapts to the circumference of the head and works well with the bicycle helmet. ~ Double-layer construction helps keep you warm The combination of two layers of material supports heat insulation and reduces temperature loss, making the cap better for riding in cold conditions. Outer layer protects against wind Nylon-infused fabric helps reduce the effects of cold air while maintaining a lightweight and comfortable fit during activity. Inner layer helps retain heat The soft fabric on the inside supports thermal insulation and improves comfort during extended rides in cold temperatures. Extended design protects your ears The elongated sides better protect your ears from cold and wind, which increases comfort when riding in more difficult weather conditions. Works well with your bike helmet The thin and flexible material allows you to wear the cap under the helmet, helping to reduce sweat and increase comfort while riding.