You need gear that transitions just like your fight game does. Seven Fight Gear designed a grappling shin guard that is great for transitioning from striking to groundwork. It slips on like a sock and fits like a glove which gives you excellent protection during strikes and won't shift while grappling.
Lightweight synthetic leather
Provides excellent protection for the shins and calves
Neoprene stretch fabric for the back
Elastic closure along the top prevents it from slipping down the leg
High quality moisture wicking material throughout the interior