Athletes At Heart BoomLaces 2 Pack Laces With Power Elastic No Tie Shoelaces with Locks. Ideal for Kids & Adults. Excellent for Running, Hiking, Triathlons, Travel & More. Provides comfort and support. Improves performance. Secure, custom fit. Allowing better traction while running and eliminate pressure points. Convenience. Putting on shoes couldn't be easier or faster. For all lace up shoes. Fits all shoe styles and sizes. Simple to use. Hassle free lock system.