4 INCH SPRING MATTRESS TOPPER: Our Spring foam mattress topper is a perfect addition to your mattress. High-Density Support Foam and 1.2 inch mini Spring Core is better support and resilience than memory foam. Non-Temperature-Sensitive Memory Foam offers soft. BREATHABLE AND MACHINE WASHABLE COVER: The cover is 60% polyester and 40% viscose derived from bamboo. This mattress topper's cover is raised foaming printing, simple and attractive, It can blend well with your various styles of furniture. And is removable by zipper, machine washable. NON-TEMPERATURE-SENSITIVE MEMORY FOAM: The Top is non-temperature-sensitive memory foam, soft and more stability. Providing a good sleep experience and reduce discomfort caused by temperature changes. ANTI-SLIP BOTTOM & ELASTIC STRAP: The bottom is made with anti-slip silicone dots to increase friction and prevent displacement, plus extra 4pcs elastic straps to keep the topper secure and fit the mattress. You will freely lie in bed and don't have to waste more time on the mattress the next day. CUSTOMER-SERVICE: If you have any quality problems during use. please feel free to contact us, we'll get back to you within 24 hours. We are committed to providing a pleasant shopping experience for each and every customer. Thank you for your love and have a great day! Belffin 4 Inch Mattress Topper Queen Size Spring Core Memory Foam Firm Thick Bed Mattress Topper No Odor White Soft Breathable with Removable Cover for Body Support