Comfort. Durability. Nature. S-ION is a blend of silicone and Tourmaline that has been perfected through research and development to create not only a super soft material, but also incredibly durable. This blend produces Negative ions well known for its health benefits given off from the Tourmaline. S-ION is comfortable under the harshest of conditions, with its elasticated soft touch feel you easily forget that you even have a watch on.