Most feet on rebounders have an awful rubber off gas. The feet really smell awful. Most people that get rebounders that have this strong odor will change out their feet since most rebounder legs are the same size.
The best feet for multi purpose rebounders to maintain the grip on the floor are polymer feet. These do not mark up the floor like the standard rubber feet. For those buying rebounders and plan on jumping high out of the mat, make sure there is a metal washer just under the leg fit in right before the rubber or polymer feet. Some companies don’t have these washers and you will probably have to replace feet many times throughout the lifetime use of the rebounder. I urge people to buy replacement feet as they can get lost at the park and missing when you least expect it.
The latest generation of rebounders do not have the black rubber or polymer. The Health Circulator has yellow feet that do not off gas. I urge everyone that buys the standard rubber feet to switch their feet out with polymer feet if doing multi purpose rebounding.