Round well insulated spalock made of strong marine vinyl adapted for the Nordic climate. A round spalock should be as smooth and easy to handle as possible but at the same time durable and insulate well to reduce heating costs. Sannra spalock has a frame of strong cellular plastic reinforced with galvanized u-steel to not break if a child goes out on it. It also provides a good insulation, the fold is insulated with 3 pads for best effect.
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