Backcountry Outlet says:
Your board shorts just aren't cutting it for raft trips. When the water's freezing, or the air has an all-day chill, you need something a tiny bit warmer. Immersion Research sewed a thin neoprene short into the waistband of this guide short for a bit of insulation, and added a high band in back to keep the waistband from rubbing. The loose fit and gusseted crotch mean you can move around without fear of busting a seam.
Historic Range: $12.96-$76.95