Mummification/wrapping

Wrapping the body in materials like plastic wrap, bondage tape, or cloth strips to immobilize completely. You can wrap torso and limbs to make a person like a cocoon. Some enjoy the pressure and the relinquishing of all movement (sensory deprivation-ish). Safety: never cover face, ensure they can signal if panic (some do one arm free inside to wiggle fingers as safe signal), and don’t leave them unattended or for too long. It can get hot (temperature-wise) and one can panic once fully immobile, so this is for advanced trust.