Serta iSeries NXG 3500 Hybrid review

The iSeries NXG 3500 Hybrid is the most complete hybrid Serta sells direct. It keeps the high-density NXG memory foam and BestEdge support of the 2500, then adds micro coils above the Q4 Zoned Support System for more localized contouring and the CoolFeel Plus system, which pairs a cool-to-the-touch cover with carbon fiber memory foam. It comes in firm and medium, and Serta lists the firm for stomach or back sleepers. Unlike the 2500, it is offered in split head queen and split head king sizes for couples using adjustable bases. Serta's product data on November 10, 2026 put both queen feels at $2,599, with a Twin XL from $2,299. That is $400 more than the 2500 and $1,400 more than the Perfect Sleeper Hybrid Medium, so it makes the most sense for buyers who will use the micro coils, the firm feel or the split sizes.

Who it is for

Back and stomach sleepers with a bigger budget who want the most contouring and cooling in a Serta hybrid.

Price

From $2,299 for a Twin XL on Serta.com when checked; queen $2,599 in Serta's product data.

Serta® iSeries® NXG™ Mattress - 3500 Hybrid $2,299.00
Quoted from the vendor pricing page on November 10, 2026.

Key features

• High-density NXG memory foam and Serta support foam
• Q4 Zoned Support System with micro coils
• CoolFeel Plus system with carbon fiber memory foam
• BestEdge support
• Firm and medium feels, plus split head queen and king sizes

Strengths and weaknesses

• Strength: Micro coils add contouring that the 2500 lacks
• Strength: Offered in split head queen and split head king for adjustable bases
• Strength: Firm option for back and stomach sleepers
• Weakness: $2,599 for a queen is more than twice the Perfect Sleeper Hybrid Medium
• Weakness: No plush feel
• Weakness: The added micro coils and cooling cost $400 over the 2500

Key facts

• Queen price: $2,599 when checked
• Type: Hybrid with micro coils
• Feels: Firm, medium
• Split sizes: Split head queen and king
• Trial and warranty: 100 nights, 10 years

Where it ranks

Serta iSeries NXG 3500 Hybrid is No. 5 in our Best Serta Mattresses verdict.