Non slippery surfaces almost zero the risk of wheel locking (without stopping), thus eliminating the main reason to prefer engine braking.
Not exact matches
Having look at the back cover (pictured above), it is made of Easy Grip
surface which is textured and looks like it'll provide you with a great
non slippery gripping experience.
The black edge on the front exterior look like it may be made of some rubberised material that will provide a
non slippery grip as well as providing some impact cushioning if the Toughbook was accidentally dropped and hit a hard
surface at its edges.