Strollers with gel wheels

Gel

— wheels, similar in design to air-filled ones (see the relevant paragraph), but filled not with air, but with a special gel. The main advantage of this option is insensitivity to small punctures and cuts: when it comes out, the gel in the tyre solidifies almost instantly upon contact with air, effectively sealing the damage site. In addition, these wheels are practically maintenance-free — they do not need to be pumped up.

The disadvantages of gel tyres include high cost and greater rigidity than air-filled tyres (although in terms of softness, such wheels are still noticeably superior to rubber and, especially, plastic ones).