To quote the company blurb
New for 2006! Poly Fleece separates are the latest technological advance in wetsuits. Polyolefin is a fleece lined material that wicks away moisture while insulating your body. Since it is extremely lightweight and does not add bulk, items can be worn under wetsuits for the ultimate insulating layer! Time to retire your old Lycra rashguard, our Poly Tops provide the ultimate in rash & UV protection + the added benefit of warmth without bulk.
Now to me this seems a great idea for cold winter surfs but are they practical for surfing. Has anyone tried them out?