BG Climbing Belay Glasses for Rock Climbing – Comfortable Prism Glasses for Belaying – Climbing Gear & Accessories for Belayers (Blue)COMFORTABLE Comfortable belay glasses for rock climbing with perfect vision on the climber and surroundings while belaying STURDY Only high quality materials (zero defect BK7 prisms) are used and a strict quality control is applied. PRACTICAL Easy to use, hardcase with carabiner, neck strap, microfiber glasses cloth and spare screws included TECHNICAL The prisms are designed to have a perfect alignment. The BG belay glasses also have the perfect angle