I wear my contacts and wraps when I'm on the roadbike. I also carry the contact case and the Rx insert just in case I need to switch over in the event the contacts become troublesome. I haven't yet dared to wear my contacts while MTBing. I use the inserts for that which can be troubling because since you're not moving as fast or constantly, sweat can build up and drip down between the wrap and the Rx lens and there's no good way to wipe it off aside from stopping to remove the insert.