I've got the MEC Whoosh pants (not sure why they're not listed - maybe just an inopportune time to rotate in new inventory), which are the breathable MEC cycling waterproof pants - the Splash pants will get a bit moist from sweat as they aren't breathable. They're definitely roomy enough to fit lots of clothes underneath if one was so inclined, but I found the waist elastic strong and snug so they don't move.