"Extra grip" means having a stronger and better hold or traction on something, like when you can grab or hold onto it more firmly or securely. Full definition
While for extra grip in your shower tray or bath, we also offer a non slip range of bath and shower mats. (romanathome.com)
They also provide extra grip for canines with bad hips or dogs with arthritis that cause them to slip on hardwood floors. (topdogtips.com)
The fabric feels soft in the hand, provides loads of extra grip, and gives the Pixel 2 a real stylish statement you won't find anywhere else. (digitaltrends.com)