I find these are too tight to fit easily onto my cot mattress, which is about 75cm wide. Especially if I'm trying to layer them up. I don't like that the waterproof layer is a separate layer to the sheet, so it ends up being wrinkled underneath the top sheet and I can never get it to lay flat properly. I also don't like how the waterproof layer doesn't go down the sides of the sheet, so when my baby vomited down the side of the cot, the mattress still got wet. Colours are nice and they wash well...