I was instructed to wear a shirt with sleeves so that the hammock wouldn't rub my skin, and to not wear anything made of silk or other slippery materials. (health.com)
The bathtub should not be made of slippery material as the baby can slip and get injured while bathing. (momjunction.com)
The not - so - slippery material in the back facilitates the finger gesture pretty well. (bbebooksthailand.com)