De Soto uses limestone for its T1 Wetsuits

Over the past few years an unlikely material has found its way into wetsuits: limestone. One would think that using rock to create rubber might cause a wearer to sink, but the porous yet closely-packed cells found in a limestone-based rubber is said to make the wearer more buoyant. De Soto Sports, a San Diego-based company that makes clothing and gear for triathlons, developed its own brand of limestone-based rubber, GreenGoma, to use in its wetsuits. Starting with the 2012 line, which first hit stores this past fall, all of the company's T1 wetsuits are made with GreenGoma, which eliminates the use of petroleum products in the line.

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