{"product_id":"siless-liner-157-4-mm-closed-cell-foam-sound-deadening-thermal","title":"Siless Liner 157 (4 mm) Closed Cell Foam Sound Deadening - Thermal","description":"\u003cp\u003eIn this review the Siless Liner 157 (4 mm) is evaluated as a practical, budget-friendly thermal and sound insulation mat for automotive projects. The single biggest reason to buy is its combination of closed-cell polyethylene foam and a full adhesive backing that delivers strong thermal blocking and lightweight waterproofing at a price much lower than similar materials. For installers who need a flexible, compressible liner to reduce radiant heat and damp vibration without a heavy overlay, this product is a straightforward solution.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-cell foam:\u003c\/strong\u003e The polyethylene formulation is waterproof and oil resistant, so it will not absorb moisture or develop an odor in vehicle environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-adhesive backing:\u003c\/strong\u003e A factory-applied adhesive layer makes installation easier and helps the material conform to metal surfaces for optimal thermal contact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat blocker:\u003c\/strong\u003e The liner is specified to block up to 98% of radiant heat transfer, reducing engine and exhaust heat intrusion into cabins and engine bays.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight and compressible:\u003c\/strong\u003e At 4 mm thickness the foam is easy to handle, trim, and fit into tight cavities without adding significant mass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature tolerance:\u003c\/strong\u003e The material shares operating temperature characteristics with rubber foam up to about 215 degrees Fahrenheit for typical automotive exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValue for money:\u003c\/strong\u003e With 36 ft2 per roll and a low per-square-foot cost compared with similar products, it is economical for large coverage jobs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Siless Liner 157 is best for car owners, DIY installers, and professional technicians who need a lightweight, waterproof thermal barrier for trunks, floors, doors, or engine bay shielding. It works particularly well when layered over butyl-based deadeners to combine vibration damping with radiant heat protection.\u003c\/p\u003e\u003cp\u003eIt is less suitable for users who require very thick multi-layer acoustic treatments or who need products rated for continuous exposure far above 215 degrees Fahrenheit; in those cases a higher-temperature or thicker specialized mat would be more appropriate.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEffective radiant heat blocking and measurable interior temperature reduction when installed in engine bays or under carpeting.\u003c\/li\u003e\n\u003cli\u003eWaterproof closed-cell foam resists moisture and odor, making it durable in vehicle environments.\u003c\/li\u003e\n\u003cli\u003eEasy to trim and apply thanks to the self-adhesive layer and flexible 4 mm sheet thickness.\u003c\/li\u003e\n\u003cli\u003eLarge 36 ft2 roll offers good value compared with pricier alternatives.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSome customers report mixed experiences with stickiness and tearability, so heavy or repeated repositioning can be difficult.\u003c\/li\u003e\n\u003cli\u003eAt 4 mm it provides less mass for low-frequency vibration damping than thicker multi-layer deadeners alone.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSiless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eClosed-cell polyethylene foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e157 mil \/ 4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoverage\u003c\/td\u003e\n\u003ctd\u003e36 ft2 per roll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoll size\u003c\/td\u003e\n\u003ctd\u003e15.74 in x 330.7 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003eUp to 215 degrees Fahrenheit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdhesive\u003c\/td\u003e\n\u003ctd\u003eFactory-applied self-adhesive waterproof glue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Siless Liner 157 (4 mm) is a practical, cost-effective thermal barrier for automotive projects that need waterproof, lightweight insulation with easy installation. It is a smart buy for anyone wanting to reduce radiant heat and improve cabin comfort without paying a premium, though installers seeking heavy mass damping or extreme temperature ratings should consider complementary or alternative products.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs the liner waterproof?\u003c\/strong\u003e\u003cbr\u003eYes, the closed-cell polyethylene formulation and waterproof adhesive prevent moisture absorption and resist odor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan it be used in engine bays?\u003c\/strong\u003e\u003cbr\u003eYes, it is used to block engine and exhaust heat, but keep long-term temperature exposure below about 215 degrees Fahrenheit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much coverage does one roll provide?\u003c\/strong\u003e\u003cbr\u003eOne roll covers 36 ft2 and measures roughly 15.74 in by 330.7 in.\u003c\/p\u003e","brand":"Siless","offers":[{"title":"Default Title","offer_id":48159001182427,"sku":"B07B75PD8B","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71hPG3ihjXS._AC_SL1500.jpg?v=1768825712","url":"https:\/\/gearmusthave.com\/products\/siless-liner-157-4-mm-closed-cell-foam-sound-deadening-thermal","provider":"GearMustHave","version":"1.0","type":"link"}