Based on the success of the Stratus Jacket, Sun Mountain has added Short-Sleeve Pullovers to the Stratus Collection. Like the Jacket, these pieces are constructed with a fabric developed by our Japanese partner for use in hot, humid climates. This two-layer, waterproof fabric has a 20K/20K waterproof/breathable rating. Stratus is lightweight, comfortable and has mechanical stretch for freedom of movement. Two-year waterproof guarantee.