Mainstays 6 in Twin Innerspring Mattress vs MLILY 6 Inch Memory Foam Mattress

Buy the Mainstays for a bunk, trundle or guest bed where a firm, low-profile innerspring makes sense and the cover and foam certifications matter. Buy the MLILY if you want an all-foam twin that isolates motion and sleeps cooler than a spring core. Owners rate the Mainstays well overall, but a 6-inch innerspring is thin and firm, so heavy sleepers and side sleepers who want cushioning should look elsewhere. The MLILY's medium-firm memory foam suits back and stomach sleepers better, though memory foam can sleep warm and soften in a hot room.

• Choose the Mainstays if you need a firm, thin twin for a bunk, trundle or dorm and want certified foam and cover materials.
• Choose the MLILY if you want a memory foam twin that absorbs motion and cradles pressure points at medium firm.