{"product_id":"shademart-18-ft-x-21-ft-white-rectangle-shade-sail-upf50-protection","title":"ShadeMart 18 ft x 21 ft White Rectangle Shade Sail - UPF50 Protection","description":"\u003cp\u003eIn this review of the ShadeMart 18' x 21' White Rectangle Shade Sail, the bottom line is simple: it is a practical, heavy-duty option for anyone who needs reliable sun protection without trapping heat. The primary reason to buy is its woven HDPE fabric that blocks up to 95% of harmful UV rays while remaining water and air permeable, so it substantially lowers temperatures and performs well over patios, carports, pergolas and garden areas. The review covers build, installation, and real-world usefulness for outdoor shading projects.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e The woven HDPE fabric delivers durable, UV resistant coverage while remaining breathable so air flows through the canopy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV Protection:\u003c\/strong\u003e Rated UPF50 and able to block up to 95% of sunlight, it meaningfully reduces exposure and surface temperatures beneath the sail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Hardware:\u003c\/strong\u003e Stainless steel D rings attached to heavy duty white webbing provide sturdy anchor points for secure mounting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Permeable:\u003c\/strong\u003e The design allows water to pass through instead of pooling, reducing stress on mounting points during rain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom Size Options:\u003c\/strong\u003e Manufacturer customization is available so you can order a sail closer to your exact venue measurements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyling:\u003c\/strong\u003e A rectangular shape in white that integrates with many outdoor decors and can act as both shade and a decorative canopy.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe ShadeMart rectangle shade sail suits homeowners and small-property managers who need a durable, breathable canopy for patios, carports, pool areas, vegetable gardens and pergolas. It is a good pick for people who want strong UV protection without creating a sealed, hot space, and for DIY installers who will use proper hardware kits to attach to walls, poles or trees.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include buyers who require a fully waterproof shelter or a rigid structure - this fabric is intentionally water permeable and will not replace a solid roof. Also, if precise off-the-shelf sizing is mandatory, confirm measurements before ordering because custom and manual measurements can vary slightly.\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\u003eHigh UV protection that blocks up to 95% of harmful rays and lowers temperatures under the canopy.\u003c\/li\u003e\n\u003cli\u003eBreathable, water permeable HDPE fabric prevents pooling and improves airflow on hot days.\u003c\/li\u003e\n\u003cli\u003eStainless steel D rings and heavy webbing create reliable anchor points and strong stitching at corners.\u003c\/li\u003e\n\u003cli\u003eCustom sizing options and clean rectangular styling fit many outdoor layouts and design schemes.\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 does not provide complete rain protection for furniture or vehicles beneath it.\u003c\/li\u003e\n\u003cli\u003eColor and size can vary slightly due to manual measurement and manufacturing tolerances.\u003c\/li\u003e\n\u003c\/ul\u003e\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' 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\u003eFunctionality\u003c\/td\u003e\n\u003ctd\u003eWater permeable, breathable, UPF50 UV resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ShadeMart 18' x 21' White Rectangle Shade Sail is a sensible, value-oriented choice for anyone needing effective sun protection and airflow rather than a waterproof cover. Its durable HDPE fabric, sturdy D ring anchors and good UV blocking make it particularly useful for patios, carports and garden areas; buyers who need rainproof coverage should consider 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\u003eAnswer. No, the fabric is water permeable and designed to allow water and air through rather than act as a waterproof membrane.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be attached to trees or poles?\u003c\/strong\u003e\u003cbr\u003eAnswer. Yes, with proper hardware kits the stainless steel D rings and heavy webbing allow attachment to poles, trees, walls or roofs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it reduce temperature under the sail?\u003c\/strong\u003e\u003cbr\u003eAnswer. Yes, the UPF50 fabric blocks most sunlight and typically lowers temperatures below the sail compared to direct sun.\u003c\/p\u003e","brand":"ShadeMart","offers":[{"title":"Default Title","offer_id":48252835463387,"sku":"B0BTTYPNPF","price":190.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/91DmqjpB52L._AC_SL1500_61ff0f73-bda5-4d4e-bf76-c42b67f2f124.jpg?v=1776381698","url":"https:\/\/gearmusthave.com\/products\/shademart-18-ft-x-21-ft-white-rectangle-shade-sail-upf50-protection","provider":"GearMustHave","version":"1.0","type":"link"}