Features:1. Stable Design: a stable protection design to keep your Mattress Sheet Stays tidy all the time.2. ELASTIC SHEET STRAPS: this air mattress cover keeper lock for holding sheets is elastic so it can keep sheet wrinkle free and work with all types of bedding. Strong sheet tightener can be used in adjustable sheet , couch cushion, bunk, RV sheet, fitted sheet, flat sheet3. helps ensure a secure fit. Sheet snap is easy to install, just raise one corner of a mattress, it can be installed by one person, no heavy lifting required4. Multipurpose: these versatile bed sheet Holder Straps work with all types of bedding5. PURCHASE WITH GUARANTEE FOR SHEET STRAPS CLIP: we will provide you with high quality hold up stretchy fitted sheet bungee, but if you don& 39;t like your new adjustable sheet retainers,please just reach to us