Outdoor ShadeSail provides sun protection, innovative design and value in one. The ShadeSail allows rain to pass through- water will not collect or pool. The reinforced stitched corners with steel fittings attach for quick and easy mounting points. The innovative fabric design blocks 90% of harmful UVA and UVB rays yet is remarkably breathable, allowing air to circulate. Use more than one ShadeSail to mix and match to create your own unique outdoor living space.