Lacing by Lock Laces. Turn any pair of lace-up tennis shoes into slip on sneakers. STRETCH FIT COMFORT: it is elastic laces conforms to your foot for a custom fit. Added compression reduces pressure points to make your feet feel better throughout the day so you can perform your best! PERFECT FOR EVERYONE: LOCK LACES are a great gift for seniors suffering from arthritis or other disabilities, autistic children, runners looking to speed their triathlon transition up, or casual users SIMPLE INSTALLATION: One size fits all (kids AND adults), quick to install, easy to use. Each pair is suitable for lacing up 1 pair of shoes. Easy installation instructions and videos provided. 100% SATISFACTION GUARANTEE: LOCK LACES are guaranteed to last the life of one pair of lace up tennis shoes. We know that once you try them in your shoes, you'll never go back to traditional shoelaces