Serta PerfectSleeper Wondrous Smooth Top Plush - 13"

The Serta Perfect Sleeper Wondrous is a 13" smooth top plush mattress built with a 3-zone coil system, a Serta® Relief-Gel Zone centered under the lower back, and a layered comfort system of Cool Twist® Gel Memory Foam, wool, and CoolFeel™ Plus Fabric.

It’s designed as an accessible, comfort-forward mattress — softer and simpler in construction than the zoned hybrid lines above it, but still purpose-built around the areas of the body that need the most attention overnight.

Wondrous at a Glance

• Comfort level: Plush (position 4 of 5: Extra Firm, Firm, Medium, Plush, Ultra Plush)
• Profile height: 13"
• Top type: Smooth top
• Support system: 3-zone coil design (comfort / support / comfort), with a Serta® Relief-Gel Zone in the center third for extra lower back support
• Comfort layer: Cool Twist® Gel Memory Foam, plus a layer of wool
• Cooling: CoolFeel™ Plus Fabric
• Adjustable base compatible: Yes
• Certification: CertiPUR-US® certified
• Warranty: 10-year warranty
• Country of manufacture: Made in Canada (domestic and imported parts)

A Good Fit If You’re:

• A side sleeper who wants soft cushioning at the shoulders and hips without paying for a more heavily-engineered zoned system
• Looking for an entry point into a better night’s sleep without the price tag of a hybrid or latex mattress
• Someone who deals with lower back discomfort and wants a dedicated gel support zone right where it counts
• Setting up a guest room or secondary bedroom where comfort matters but budget is a real factor
• Someone who likes the breathable, natural feel of a wool layer along with foam cushioning

What Stands Out on the Wondrous

• The Relief-Gel Zone isn’t just a marketing layer — it’s placed specifically in the center third, under the lower back, where support matters most for most sleepers
• Wool adds a layer of natural, breathable comfort on top of the gel memory foam, which most plush mattresses in this price range skip
• CoolFeel™ Plus Fabric addresses the biggest downside of plush memory foam mattresses: heat retention
• Three zones keep this simpler design from feeling like a single slab of undifferentiated foam

Comfort-First, Built with Intention

The Wondrous is proof that a simpler 3-zone build doesn’t have to mean generic comfort. By concentrating gel support specifically under the lower back — the area that suffers most on a poorly-designed plush mattress — Serta built in the one piece of targeted support that plush sleepers actually need, then layered wool and cooling fabric on top for genuine, well-rounded comfort.

See the Wondrous in Person at Mr. Liquidator

Plush mattresses feel different from person to person — this one’s worth a test lie-down. Visit Mr. Liquidator Mattress Outlet in Chilliwack to try the Wondrous yourself, or ask us about pickup and delivery anywhere in the Fraser Valley.