These are so stupidly hard to put on the sheets properly. But man, once on, they work great!!Let me explain, you get a package with four strap sets inside. They create a “T” like shape, and you are left with the challenge (should you chose to accept it) of finding the perfect position on each corner of your fitted sheet to cause the right amount of pull and stretch, to achieve the perfect, wrinkle feel, sleep. Now, personally, I’ve never used something like this before, so call me naïve, but it took far too many attempts to get them positioned right. However, once I actually achieve said perfect position, they do work really well. I particularly like the clasp, and the locking flap on the claps. Not a single one has fallen off, and they are actually kinda hard to remove, which makes me feel safe, since I have an open bed frame, and cats that like to cause mischief.A great product, and once you perfect the positioning of the clasps, easy to use, and no more wrinkles or corners popping up!Hard to get in just the right spot on the sheet but once you do it stays as long as you need itThese straps seem to be perfect for the task of holding the bed sheets down, more sturdy than my 40-yr old straps of the past. Time will tell. I like the 3-way attachments.They hold really well. They have a different design on the corner strap compared to the side so you can put on easier. And tightened after you put on is greatTired of waking up sleeping on the mattress cover. Pee add in to put on, but they work!Feels silly to be delighted with so simple an gadget but it makes a huge difference and really keeps sheets in their place.Fairly easy to install. takes very little effort. Just lift each corner and clip clip clip.Best straps I’ve ever used