Special Supplies Sensory Body Sock Full-Body Wrap to Relieve Stress, Stretchy, Breathable Cozy Sensory Sack for Boys, Girls

Do this have a chemical smell to it?

Is it machine washable?

Are they slippery to walk in? I have all tile floors and I’m worried that the child will fall in this

I don't understand the sizing. It gives the measurements but not what that translates to with a child's height. Mine is 55.5 inches tall. What size?