Nylon sheet fasteners are just what i needed. They hold very securely. Plastic clenching system may not be as durable as metal ones.

These sheet straps provide a simple and effective solution to keep your sheets firmly in place, preventing them from slipping or bunching up during the night. These sheet fasteners creates the appearance of a freshly made bed all the time, even after ...  Read More

The idea is to get the whole assembly of straps underneath the mattress. When all of the straps are attached just start tightening the adjustments until there's enough tension to keep the sheet in place. You can also tighten them up.

This sheet holding apparatus is expandable and can hold the sheet really well. It holds the sheets tight with no wrinkles even if you raise and lower the head of the bed. The stretching straps are a good quality. But it's annoying to install at first,...  Read More

Once it's set removing and reinstalling it is easier. The trick is it being 6 prong instead of 4 like the others.

The problem is the design and durability. It's too difficult lifting the king size mattress and running the sheet fasteners below and across the mattress. Six is not enough of the straps. Not good for bed sheet with no garters.