The RT1 series features interchangeable 3-position ratcheting bayonet temples and an adjustable elastic head band with each pair. A unique feature of the head band with hook and loop closure is the ability to adjust with one hand while wearing. The RT1 also features full length, non-slip TPR temple sleeves for comfort and grip. A closed cell foam seal provides optimum protection from small particles and debris. The light weight nylon frame and polycarbonate wrap-around lens design provides greater side impact protection. This foam lined sealed eyewear could be used as motorcycle safety glasses! Choose the best safety glasses, choose MCR Safety!