Bamboo sheets and why they slip less
Short answer: A sheet slips when the corners are too shallow for the mattress, or when the elastic has lost its stretch. The material matters less than those two things.
The corner depth has to fit
If the mattress is thick and the sheet corners shallow, the elastic sits on the edge instead of under the mattress. Then it slips at the first movement. See bamboo bedding.
Elastic all the way round
A sheet with elastic all the way round sits better than one with elastic only in the corners. It is a cheap detail that matters a lot.
The surface against the mattress
A smooth mattress cover lets the sheet slide. A rough cover grips. It is often the cover and not the sheet that is the problem.
The nightwear plays a part
Smooth nightwear against a smooth sheet gives the most movement. See bamboo nightwear for women.
Wash without stretching
Do not pull at the sheet while it is wet. Wet fabric stretches and does not fully come back. See washing and care.
Frequently asked questions
Why does my sheet slip?
Because the corners are too shallow for the mattress, or because the elastic has lost its stretch.
Is elastic all the way round better?
Yes, clearly. Elastic only in the corners holds less well.
Can the mattress be to blame?
Yes. A smooth mattress cover lets the sheet slide however well it fits.