Great layer of cover you hips and a$$ non-ristrictive protection.
These Fox shorts are a perfect combination of light to moderate protection (have no illusion that these are downhill/big hit adequate, they're not) for us CC and all-mountain trail rider guys and gals. They add a layer of padding in critical areas by don't restrict movement or get in the way. These also turn any board short into a MTN bike short by wearing them under them.
Bottom line is they'll keep you from getting bruised up in light to moderate tip overs and lessen the hurt in a big one. I bought three sets and they launder well in the delicate cycle and I hang them to dry.
I bought size large and I wear waist size 34 560 brand Levis if that helps with sizing.