{"product_id":"shademart-16-ft-x-21-ft-red-sun-shade-sail-upf50-rectangle-canopy","title":"ShadeMart 16 ft x 21 ft Red Sun Shade Sail - UPF50 Rectangle Canopy","description":"\u003cp\u003eIn this review of the ShadeMart 16 ft x 21 ft Red Sun Shade Sail the bottom line is simple: this is a heavy-duty, breathable rectangle canopy best for homeowners who need reliable UV protection and large-area coverage for patios, carports, or poolside shade. The strongest reason to buy is the fabric and construction - woven HDPE blocks up to 95% of harmful UV while remaining water permeable and breathable, so it cools outdoor spaces without trapping heat. The review covers usability, durability, and real customer impressions.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWoven HDPE fabric:\u003c\/strong\u003e provides high UV resistance while remaining breathable so the area beneath stays cooler and ventilated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel corner D rings:\u003c\/strong\u003e attached to heavy duty white webbing for secure, low-corrosion anchor points that hold up in outdoor conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater permeable design:\u003c\/strong\u003e allows rain and air to pass through the sail so water does not pool and wind loads are reduced.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge rectangle coverage:\u003c\/strong\u003e the 16 ft x 21 ft size offers substantial shade for patios, carports, or pool areas and can lower temperatures noticeably under the sail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom size options:\u003c\/strong\u003e ShadeMart offers a selection of custom sizes so buyers can match irregular venues when precise fit matters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe ShadeMart 16 ft x 21 ft rectangle sail is ideal for homeowners and renters who want a durable, high-coverage shade solution that blocks most UV and improves comfort on a patio, over a pergola, or above a carport. It suits DIY installers who can anchor the sail to poles, trees, walls, or roofs using appropriate hardware kits and who appreciate a breathable, non-waterproof canopy.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include buyers who need a waterproof solution or who require an exact factory-cut fit without any measurement tolerance; this style is explicitly not waterproof and customers should measure carefully because manual size variations can occur.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent UV protection, blocking up to 95% of harmful rays for safer outdoor time.\u003c\/li\u003e\n\u003cli\u003eDurable construction with woven HDPE and stainless steel D rings for long service life in outdoor conditions.\u003c\/li\u003e\n\u003cli\u003eBreathable and water permeable, preventing water pooling and reducing wind stress on attachment points.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot waterproof, so it will not keep out heavy rain and is intended only for shade and UV protection.\u003c\/li\u003e\n\u003cli\u003eSize variations from manual measurement mean buyers must verify dimensions carefully before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct shape\u003c\/td\u003e\n\u003ctd\u003eRectangle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e16 ft x 21 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eWoven HDPE (High Density Polyethylene)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorner hardware\u003c\/td\u003e\n\u003ctd\u003eStainless steel D rings on heavy duty white webbing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater resistance\u003c\/td\u003e\n\u003ctd\u003eWater permeable, not waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV protection\u003c\/td\u003e\n\u003ctd\u003eBlocks up to 95% of UV rays (UPF50)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCustom options\u003c\/td\u003e\n\u003ctd\u003eCustom sizes available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ShadeMart 16 ft x 21 ft Red Sun Shade Sail is a practical buy for anyone who needs a large, durable shade canopy that cools outdoor spaces and blocks most UV. It offers good value through sturdy materials and breathable design, but it is not a waterproof cover, so buyers who need rain protection should choose a different product.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this shade sail waterproof?\u003c\/strong\u003e\u003cbr\u003eThis style is water permeable and breathable, not waterproof, so rain will pass through rather than be shed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it block the sun effectively?\u003c\/strong\u003e\u003cbr\u003eYes, the woven HDPE fabric blocks up to 95% of harmful UV and noticeably reduces temperature under the sail.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I customize the size?\u003c\/strong\u003e\u003cbr\u003eShadeMart offers a selection of custom sizes; measure the installation area carefully because manual measurements may vary.\u003c\/p\u003e","brand":"ShadeMart","offers":[{"title":"Default Title","offer_id":48621472186587,"sku":"B091PN5DVQ","price":167.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/A1gstAiWFwL._AC_SL1500_20a3dda2-63a4-41df-b440-535fcbeadad6.jpg?v=1778458524","url":"https:\/\/gearmusthave.com\/products\/shademart-16-ft-x-21-ft-red-sun-shade-sail-upf50-rectangle-canopy","provider":"GearMustHave","version":"1.0","type":"link"}