Summer often complicates sleep: stifling heat, night sweats, fatigue upon waking. Cooling mattress toppers are a simple and effective alternative to improve thermal comfort without replacing your entire bed. Here is our 2025 comparison of three flagship models: Slome (formerly Hypnia) Essential, Mello Reversible, and Emma Reversible.
Why is this comparison useful?
Heatwaves are becoming more frequent. A well-chosen temperature-regulating mattress topper allows:
- To limit nighttime awakenings due to heat
- To improve sleep quality without overheating
- To extend an existing mattress while gaining comfort
Selected Brands
- Slome (formerly Hypnia): known for its affordable memory foam mattress toppers
- Mello: independent French brand, renowned for its reversible products
- Emma: European leader in bedding, with a technical and modular approach
Comparison of Tested Models
Slome (formerly Hypnia) – Essential Mattress Topper
- Thickness: 5 cm
- Material: memory foam
- Cover: bamboo, breathable
- Thermoregulation: average
- Trial / Warranty: 120 nights / 15 years
Recommended for those seeking relief from back pain on a budget.
Mello – Reversible Mattress Topper
- Technology: 1 side memory foam, 1 side plush microfiber
- Breathability: excellent, washable cover
- Manufacturing: French, OEKO-TEX certified
- Trial / Warranty: 100 nights / 5 years
Excellent for adjusting comfort according to the seasons, highly appreciated in summer.
Emma – Reversible Mattress Topper
- Technology: Airgocell foam + HRX foam
- Comfort: balanced, bouncy feel
- Cover: elastic, washable
- Trial / Warranty: 100 nights / 10 years
The most versatile for year-round use, including summer.
Summary Comparison Table
| Criterion | Slome (formerly Hypnia) Essential | Mello Reversible | Emma Reversible |
|---|---|---|---|
| Comfort | Very plush | Plush/modular | Balanced |
| Composition | Memory foam + bamboo | Memory foam + fiber | Airgocell + HRX |
| Thermoregulation | Average | Good | Good |
| Trial | 120 nights | 100 nights | 100 nights |
| Warranty | 15 years | 5 years | 10 years |
| Price | Affordable | Medium | Higher |
| Customer Reviews | 4.6/5 | 4.7/5 | 4.5/5 |
Expert Advice
Who is each model for?
- Slome (formerly Hypnia): ideal if you have lower back pain and seek a enveloping feel
- Mello: perfect for those who want to adjust their comfort according to the season
- Emma: a good choice if you sleep as a couple or want stable comfort year-round
To Avoid
- Avoid overly dense foams if you sweat a lot
- Always check the breathability of the cover
- Choose the right size, suitable for your mattress
Comfort Preferences
- Plush: Slome (formerly Hypnia), Mello (microfiber side)
- Balanced: Emma, Mello (memory foam side)
- Firm: none of the models are truly firm