XtraEdge took a minimalist approach when designing our patented weighted gloves. We used the best wicking and breathable materials available that could also support the weights and prevent shifting when running. Your hands stay happy and cool if you are inside on a treadmill or outside on the track. The permanent weight in the top of the glove is a weighted sand so it conforms to your hand. The steel-coated palm weight is removable and designed to fit perfectly in your hand. XtraEdge gloves come in unisex sizes of small, medium, large and X-Large