The hedgehog is a patented device with parabolic studs which fit onto a standard hand pull trolley and allows it to be used without harming the golf course many greenkeepers now insist upon hedgehog fairway protectors during the inclement winter months many golf clubs ban hand pull trolleys in winter because the flat wheels compact and smear the turf in wet conditions and burn the grass in frosty conditions the unprotected turf then takes longer to recover and so the bans are imposed the ini