I designed and sewed 75 sets of these seat belt shoulder pads. The local PCA region gave them to entries in their big charity car show.
They are rip stop ballistic nylon with a felt back to keep a grip on your shoulder, have closed cell foam for padding, stay wrapped around the belt with velcro, and have an embroidered Porsche logo.
Interesting that while I was sewing them up the girl in the picture needed my help on a project. I agreed to help if she would help me sew up the pads. She was both home schooled and took sewing in home economics classes. She couldn't sew worth a toot. I ended up doing all the sewing myself.