{"product_id":"shademart-20-ft-x-21-ft-black-sun-shade-sail-upf50-rectangle-durable","title":"ShadeMart 20 ft x 21 ft Black Sun Shade Sail UPF50 Rectangle - Durable","description":"\u003cp\u003eIn this review of the ShadeMart 20' x 21' rectangle shade sail we look at who should consider this canopy and why it stands out. The bottom line: this is a heavy-duty, breathable sun sail best for homeowners and RV or carport owners who need reliable UV protection and airflow rather than a waterproof cover. The sail's woven HDPE fabric, stainless steel D-rings and reinforced webbing deliver solid build quality and sun blockage, making it a practical choice for patios, pergolas and vehicle covers.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWoven HDPE fabric:\u003c\/strong\u003e The high density polyethylene weave lets air and water pass through while providing durable protection against sun damage and wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel D-rings:\u003c\/strong\u003e Rust-resistant D-rings at each corner make it simple to secure the sail and hold up better in wet conditions than plated hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble webbing and reinforced seams:\u003c\/strong\u003e All edges are double layered and stitched to prevent fraying and extend the life of the sail under tension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPF50 and 95% UV blockage:\u003c\/strong\u003e The fabric blocks up to 95% of harmful UV rays and can lower shaded temperatures by roughly 10 to 15 degrees, improving outdoor comfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater and air permeable:\u003c\/strong\u003e The sail is breathable so rain drains through instead of pooling, reducing the chance of sagging during storms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom size options:\u003c\/strong\u003e Multiple sizes and customization are available so buyers can match the sail to patios, carports, pools, or pergolas when measured carefully.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe ShadeMart 20' x 21' sail is ideal for homeowners with medium to large outdoor spaces who want dependable sun protection without trapping heat or water. It particularly suits RV owners, carport users and patio owners who need a breathable canopy that reduces temperatures and shields surfaces from UV fading.\u003c\/p\u003e\n\u003cp\u003eThose seeking a fully waterproof cover or an exact off-the-shelf fit should look elsewhere; this style is intentionally water permeable and customers should measure carefully before ordering a custom size since dimensions are manually made and may vary slightly.\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\u003eSolid build quality with stainless steel D-rings and reinforced stitching that customers praise for durability.\u003c\/li\u003e\n\u003cli\u003eExcellent sun protection, blocking up to 95% of UV and noticeably cooling shaded areas.\u003c\/li\u003e\n\u003cli\u003eBreathable design prevents water pooling and remains effective in windy conditions when properly installed.\u003c\/li\u003e\n\u003cli\u003eCustom size options let you fit the sail to diverse applications like patios, pools or carports.\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 - the fabric is designed to be water permeable, so it will not keep heavy rain fully out.\u003c\/li\u003e\n\u003cli\u003eColor can vary slightly and precise sizing relies on careful measurement, which some customers note as a limitation.\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\u003e20' x 21'\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\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eStainless steel D-rings with heavy duty white webbing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Protection\u003c\/td\u003e\n\u003ctd\u003eUPF50, blocks up to 95% UV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Resistance\u003c\/td\u003e\n\u003ctd\u003eWater permeable \/ breathable (not waterproof)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ShadeMart 20' x 21' rectangle shade sail is a practical, value-oriented choice for anyone who needs robust sun protection and airflow rather than a waterproof canopy. Its durable HDPE fabric, rust-free D-rings and reinforced edges make it a long-lasting solution for patios, carports and RV covers, provided buyers accept a breathable design and take care to measure their space before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this sail waterproof?\u003c\/strong\u003e\u003cbr\u003eThe sail is water permeable and breathable, so it will not keep out heavy rain and is not intended as a waterproof cover.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I attach the sail to trees or poles?\u003c\/strong\u003e\u003cbr\u003eYes; with proper hardware kits it can be secured to poles, trees, walls or roofs for patios, pergolas and carports.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much UV protection does it provide?\u003c\/strong\u003e\u003cbr\u003eThe fabric is rated UPF50 and blocks up to 95% of harmful UV rays, helping reduce shaded temperatures by about 10 to 15 degrees.\u003c\/p\u003e","brand":"ShadeMart","offers":[{"title":"Default Title","offer_id":48177813651675,"sku":"B09XLR58R9","price":202.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81KPSgNRfmL._AC_SL1500_6d2cc244-b110-4cdb-828e-196074e30c6f.jpg?v=1769489251","url":"https:\/\/gearmusthave.com\/products\/shademart-20-ft-x-21-ft-black-sun-shade-sail-upf50-rectangle-durable","provider":"GearMustHave","version":"1.0","type":"link"}