Exercise harder, longer. The flexibility, powerful sound, and rugged design of your Jbl Endurance Peak 4 will match you beat for beat. Jbl Pure Bass Sound with Spatial Sound fuel your workout from the bottom up, and no matter how intense your moves get, the ergonomic fit of the TwistLock design means they'll always stay in and stay comfortable. Most of all, a waterproof and dustproof IP68 rating means the weather will never give you an excuse to stay home