é180s Exolite Adjustable Ear Warmer is specifically designed for an active lifestyle, whether you're a runner, a cyclist, or a hiker. Engineered with soft breathable fabrics to give you lightweight insulation in a low loft ear warmer, this Exolite Adjustable Ear Warmer is ultra light, thin, yet still keeps you comfortably warm. It works well with other headwear such as hats, helmets, even your glasses, and the frame collapses easily for quick storage in your pocket.é