Yurbuds Inspire Duro Blue Twistlock technology provides a secure fit that is guaranteed not to fall out even during the most demanding physical activities Flexsoft Comfort Fit tips are ergonomically designed for long-lasting comfort Sweat and water resistant design ensures that the headphones endure through rain, water and sweat Ergonomically designed to allow ambient noise so you are aware of your surroundings during active use Woven cloth cord is tangle and tear resistant