The woven polyester material is ridged and has a hard surface that makes it easier for traditional wheelchairs to get all the way to where the harder packed sand begins. The added benefit is also realized by any one on a bike, pushing a stroller or pulling a cart full of beach stuff.
There are also beach wheelchairs that with their big tires make the going easier for anyone pushing someone along the beach. They can be rented during your stay and at some of the resorts they are an available amenity.
The Town of Hilton Head Island lists the following beaches as having the beach matting but it is also at some of the beach entrances inside the gated communities.
Alder Lane Beach Access
Driessen Beach Park
Folly Field Beach Park
Islanders Beach Park
Mitchelville Beach Park