Swell Vision High Quality Sportman Bammboo Sunglass with Polarized Lensed, Waterproof, Lightweight and Floatable Each pair of Swell Shades is handcrafted from sustainable Mao Bamboo. Our bamboo frames are stained with high quality dye that retains a natural look. Each pair of Swell Shades are waterproof and designed for lightweight comfort and floatation. The lenses are polarized and feature anti-glare and UVA/UVB protection. The frames feature spring loaded hinges for added comfort.