For long days on the trail, Ritchey WCS Ergo Locking mountain bike grips are specifically shaped to releive stress on the hand while locked down on the bar to reduce slippage.
 
 
Material: high-density foam
Density: dual
Shape: hexagonal/ergo
Locking: dual-side
Ends: open
End-plugs: included
Length: 129mm
Diameter: multiple
Weight: 133g (w/o plugs)
Colours: black