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I've been using these on my elderly father's pressure sores, and the border film backing really does keep the dressing securely in place even when he moves around a lot. The 4x4 size covers the wound perfectly with enough adhesive edge to stick without irritating his skin. I'm glad I found something

The 3x3 size is perfect for covering the wound on my elbow, and the border film backing really does keep it in place even when I move around a lot during the day. It’s been reliable overnight, too.

It does stay on better than a standard gauze pad, so that's a plus for a tricky spot on my elbow. The adhesion is fine, though for the price I expected the foam to be a bit thicker for cushioning.