The Chain Necklace is made from premium materials. This necklace is water-resistant, heat-resistant, sweat-proof, and can be worn to the gym, out on a run, or even in the shower. Details. Handmade. High Quality. Waterproof. Scratch Free. Length: 18 inch. Positively Conscious. We've partnered with Greenspark, a climate change program that allows MHART to plant a tree or remove one piece of plastic from the ocean for every website purchase.