I don't know for mountain bike though as I have not tried it on rougher terrains. It has very good grip and your feet stay put in them but never tried them in rain, or "muddy" condition.

Forgot to say I also got flat pedals that are much better too than the "cheaper" standards they'd normally put on your bike. Not too big either for a road bike. I don't know the name/brand but they are much smaller, grip is not over the top but not slippery either. Did not want to scratch my legs with the pedal pins everytime I hit the pedals when coming on/off the bike. I could take a picture though...or check my invoice for the name.

The toe-clips were not expensive. Around $10. These are the exact one. : Evo Double Quick Toe-Clips For ATB/Hybrid Black. No need for straps