NAB 2015, SHAPE gives us an overview of two single handed pistol-grip style Gimbal stabilizers. The iSEE (for GoPro) and a larger iSEE+ designed for small DSLR or mirrorless Cameras. Each gimbal operates on two inexpensive and common Canon LP-E6 batteries, so you don't need to sit around and recharge.
So while most GoPro gimbals don't allow you to use the GoPro in it's waterproof housing, the iSEE is designed for this. Other systems will probably not recommend using gimbals under wet conditions, but SHAPE doesn't seem to have any issues getting their iSEE gimbal wet as seen in the video below.
So if you're looking for a gimbal for any type of water or snowboarding activities, the iSEE may be a good choice. The decision for sticking to a 2-Axis system over a 3-Axis may be for the immediate responsiveness allowing for fast tracking and panning specifically needed in sports. For more information about SHAPE and the iSEE & iSEE+ Gimbal stabilizers, check out their website http://SHAPEWLB.com