{"product_id":"18-ft-x-21-ft-white-sun-shade-sail-upf50-rectangle-cooling-patio","title":"18 ft x 21 ft White Sun Shade Sail UPF50 Rectangle - Cooling Patio","description":"\u003cp\u003eIn this review the ShadeMart 18' x 21' white rectangle sun shade sail is evaluated as a practical choice for homeowners and small business owners who need large, breathable sun protection for patios, carports and pool areas. The single biggest reason to buy is its combination of durable woven HDPE fabric and stainless steel corner D rings, which together deliver long-lasting shade and easy anchoring. The review focuses on real-world use: sun blocking performance, breathability, and how straightforward it is to install with common hardware.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Woven HDPE fabric provides a strong, tear-resistant canopy that stands up to heavy sun exposure while remaining lightweight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV Protection:\u003c\/strong\u003e The fabric blocks up to 95% of harmful UV rays so shaded areas stay significantly cooler and protect skin and surfaces from sun damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorners:\u003c\/strong\u003e Heavy duty white webbing with stainless steel D rings gives secure attachment points that resist rust and simplify rigging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathability:\u003c\/strong\u003e Water permeable and breathable construction allows rain and air to pass through, reducing wind load and preventing water pooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom Size Options:\u003c\/strong\u003e Available in a range of custom sizes so the sail can be tailored to specific patios, carports, pergolas or poolside layouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyling:\u003c\/strong\u003e Rectangle shape and neutral white color integrate with existing outdoor decor while providing a clean, modern look.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis shade sail is best suited to homeowners, rental property managers, and small business owners who need broad, breathable sun cover for outdoor seating, carports, boat protection, or garden areas. It is a good fit when a lightweight but durable fabric is preferred over a fully waterproof canopy.\u003c\/p\u003e\n\n\u003cp\u003ePeople who need fully waterproof coverage, or those looking for an off-the-shelf exact fit without measuring, should look elsewhere; this product is water permeable and often sold in customizable sizes, so accurate site measurement and compatible hardware are required for best results.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eProvides broad shade coverage and noticeably lowers temperatures under the sail according to users.\u003c\/li\u003e\n\u003cli\u003eDurable woven HDPE resists wear and maintains color, with customers noting good durability in wind and hail.\u003c\/li\u003e\n\u003cli\u003eStainless steel D rings and heavy webbing make installation secure and the attachment points long lasting.\u003c\/li\u003e\n\u003cli\u003eBreathable design prevents water pooling and allows airflow, helping comfort on hot days.\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 areas dry in heavy rain and is intended primarily for sun protection.\u003c\/li\u003e\n\u003cli\u003eRequires accurate measuring and separate hardware for installation, which may add time and cost.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eShadeMart\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShape\u003c\/td\u003e\n\u003ctd\u003eRectangle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e18 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\u003eFunctionality\u003c\/td\u003e\n\u003ctd\u003eWater permeable and breathable; blocks up to 95% UV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Uses\u003c\/td\u003e\n\u003ctd\u003ePatio, carport, pergola, pool, yard, window cover\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ShadeMart 18' x 21' white rectangle sun shade sail is a sensible value for anyone needing large-area sun protection that breathes and lasts. It is particularly good where heat reduction and UV blockage are priorities and where a nonwaterproof, ventilated canopy is acceptable. With durable HDPE fabric and stainless steel D rings, it offers strong practical performance when sized and installed correctly.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this shade sail waterproof?\u003c\/strong\u003e\u003cbr\u003eThe sail is water permeable and breathable, so it will not be fully waterproof and is designed to allow rain and air to pass through.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it block UV and reduce temperature?\u003c\/strong\u003e\u003cbr\u003eYes, the fabric blocks up to 95% of UV rays and users report noticeable temperature reduction under the sail.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre mounting brackets included?\u003c\/strong\u003e\u003cbr\u003eHardware kits are not included; the sail requires separate appropriate hardware for poles, walls or trees depending on the installation.\u003c\/p\u003e","brand":"ShadeMart","offers":[{"title":"Default Title","offer_id":48243767673051,"sku":"B0B5M2GH27","price":190.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/91DmqjpB52L._AC_SL1500_e74070a9-0c3c-4486-a63d-1ce4a23da7f4.jpg?v=1770996300","url":"https:\/\/gearmusthave.com\/products\/18-ft-x-21-ft-white-sun-shade-sail-upf50-rectangle-cooling-patio","provider":"GearMustHave","version":"1.0","type":"link"}