We have a king size deep mattress from Nectar. It can be difficult to find sheets that actually fit how deep the mattress is, even if they claim to work for the depth size. These fit great, with some slack. My husband generally isn’t a fan of the flannel sheets as he gets too hot but he has raved about these each time we have used them about how cool they remain. Plus they match our rustic/moose/buffalo plaid bedroom decor! Will be buying again!