Doze off easily on the Serta® Brindale 4.0 firm mattress. Enjoy comfort you can trust from a brand you know, Serta®. This firm mattress gives you curve-hugging support and is topped with a layer of Cool Twist® Gel Foam with cooling gel swirled into breathable foam to promote airflow and help keep your bed cool throughout the night. Serta® A champion of comfort for all, Serta® has pioneered sleep innovation for more than 90 years, bringing quality products to more than 150 countries worldwide. Every bed across the Serta® portfolio is designed to provide superior comfort. Serta takes a consumer-centric approach in everything it does, with help from its beloved Serta Sheep, the true curators of Serta comfort. Delivery, Set-up and Mattress Haul-awaySerta’s White Glove Delivery+ Service* includes in-home delivery, up to two flights of stairs. The delivery agent will remove the mattress from packaging and set-up basic bed frames (if no tools are required). The Member may ask the delivery agent to move a used mattress to another room at the location or haul-away the old mattress from the premises. Estimated delivery time is 10 to 12 business days for standard zones; remote zones may take longer. The delivery agent will call the Member to set up an appointment. Extra-Long Comfort For taller frames, this Serta Brindale 4.0 twin XL mattress offers more room for stretching out. Use it in a small loft or dorm room for comfortable, posture-supporting sleep. Versatile Compatibility Compatibility with a platform foundation offers you a multitude of styles to choose from when outfitting your room with this Serta mattress. A platform bed with storage options delivers vast under bed storage space for storing clothes, books and out-of-season shoes. A slatted platform foundation allows air to circulate through the mattress, leaving little to no moisture for it to retain, while a solid platform delivers unending support across the expanse of the mattress. Innerspring Construction This Serta twin XL mattress has a foam layer that provides cushioning for pressure points without too much sink, while the sturdy coil core offers edge support for proper spinal alignment. Combining the best features of both mattress designs, this mattress is a comfortable, supportive choice for your space. What are the measurements? This Serta Brindale 4.0 twin XL mattress measures 10.5"H x 38"W x 79.5"L. Does the mattress come with a box spring? No box spring is included with this Serta Brindale 4.0 twin XL mattress. What kind of mattress is this? The support core of this Serta Brindale 4.0 twin XL mattress features coil construction, making it an innerspring option. Mattress Buying GuideLooking for the perfect mattress for your needs? Click to view our Mattress Buying Guide. Need Help? Ask our dedicated Sam’s Club members-only Serta hotline, staffed especially for you by Serta Mattress Specialists: 1-888-240-1945 available 24 hours/7 days a week.