Terra - Cooling Grounding Bed Sheet

The sheet barely fits my mattress which is inly 12" thick (actually doesnt come down all the way on sides) and keeps coming off or stretched so tight always showing mattress cover. I have adjustable bed and it comes off every day. I just bought some mattress sheet corners from Amazon and hoping that will help.

The sheet are comfortable but not durable. Had them for 5 months and the corners are all (with the exception of one) fraying and splitting.

Definitely not cooling at all.