All-foam mattresses are among the most searched and purchased online — especially by sleepers who want a balanced feel, pressure relief, and minimal motion transfer. Two of the most popular beds in this category are the Casper Mattress and the Lull Mattress.
In this comparison, we’ll break down comfort, firmness, cooling, support, motion isolation, edge support, durability, and value to help you decide which mattress suits your sleep style best.
Compare current pricing and availability for both mattresses below to see which best fits your budget and sleep style.
How We Test Mattresses
Our reviews are based on firsthand, hands-on testing and real-world sleep experience. We evaluate mattresses using consistent criteria, including pressure relief, spinal alignment, motion isolation, temperature regulation, and durability. We do not use any fancy gimmicks, proprietary scoring systems, or manufacturer-provided ratings. Each mattress is tested the same way so comparisons are fair, transparent, and based on actual performance, helping readers make informed, trustworthy buying decisions. Read our full mattress testing methodology!
🛏️ Quick Comparison Overview
| Feature | Casper Mattress | Lull Mattress |
|---|---|---|
| Mattress Type | All-foam | All-foam |
| Firmness | Medium (5.5–6/10) | Medium (5–6/10) |
| Best For | Side & combo sleepers | Side & combo sleepers |
| Cooling | Above average | Better than average |
| Motion Isolation | Excellent | Excellent |
| Edge Support | Average | Average |
| Trial | 100 nights | 100 nights |
| Warranty | 10 years | 10 years |
| Price Level | Mid | Mid |
💤 Comfort & Feel
Casper
The Casper Mattress offers a balanced, neutral feel that provides moderate contouring without the deep hug of memory foam. It’s designed to appeal to a broad range of sleepers.
- Gentle surface contouring
- Minimal “sink-in” feeling
- Neutral response
If comfort feel is your top priority, you can view current pricing for each mattress directly from the brands below.
Casper Mattress pricing” → Casper
“Lull Mattress pricing” → Lull
Lull
Lull Mattress also delivers a balanced foam feel but with slightly less sinking and a more even-pressure distribution.
- Light contouring
- Smooth responsiveness
- Very consistent comfort
Winner (Comfort): Lull — for slightly smoother, consistent contouring.
🧍 Firmness & Support
- Casper: ~5.5–6/10 (medium)
- Lull: ~5–6/10 (medium)
Both land in the medium range, but Lull tends to feel just a hair softer up front, while Casper feels slightly firmer under the hips.
Side sleepers:
- Lull slightly better due to more forgiving pressure relief
Back sleepers:
- Casper and Lull are both solid, with Casper offering a bit more support for average weights
Stomach sleepers:
- Casper edges out Lull due to marginally firmer support
Winner (Firmness/Support): Tie, but with Casper slightly better for stomach sleepers.
🌬️ Cooling & Temperature Regulation
All-foam mattresses typically run warmer than hybrids, but construction matters.
Casper
- Perforated foam layers help with airflow
- Better airflow than some traditional memory foam beds
Lull
- Breathable foam comfort layer
- Greater emphasis on airflow throughout
Winner (Cooling): Lull — for slightly better airflow and breathability.
🔁 Motion Isolation (Couples)
Both Casper and Lull excel at motion isolation — foam absorbs movement well.
- Excellent for couples
- Minimal bounce
- Great for co-sleepers
Winner (Motion Isolation): Tie
🔧 Edge Support
Edge support in all-foam beds is typically average:
- Slight compression near edges
- Solid for sleeping zone
- Less ideal for sitting near edges
Both models perform similarly here.
Winner (Edge Support): Tie
🪶 Durability & Longevity
Durability in foam beds depends on density and use:
- Casper: Balanced construction should last well for average-weight sleepers
- Lull: Known for consistent longevity with fewer impressions for average users
Heavier sleepers may see impressions slightly sooner, but both hold up well compared to older all-foam designs.
Winner (Durability): Lull (marginally)
💰 Trial, Warranty & Value
Both brands offer:
- 100-night sleep trial
- 10-year limited warranty
Value comes down to:
- Casper: slightly more widely known
- Lull: often priced competitively
Winner (Value): Lull
📝 Pros & Cons Summary
Casper Mattress
Pros
- Balanced comfort
- Slightly firmer support
- Good for stomach and combo sleepers
- Strong brand presence
Cons
- Not the coolest foam bed
- Edge support average
- Slightly pricier than some all-foam competitors
Lull Mattress
Pros
- Excellent airflow
- Smooth, balanced feel
- Great motion isolation
- Strong value
Cons
- Not firm enough for strict stomach sleepers
- All-foam warmth still noticeable for some
🧠 Final Verdict
Choose the Casper Mattress if:
- You prefer a slightly firmer all-foam bed
- You’re a stomach or combo sleeper
- You want a mattress with broad brand recognition
Choose the Lull Mattress if:
- You prioritize pressure relief and airflow
- You’re a side sleeper or couples
- You want strong motion isolation and smooth contouring
Overall, while both are strong all-foam options, Lull edges out Casper for most sleepers due to better airflow and broader comfort appeal.
If you’re ready to choose, here’s where to check the latest availability and policies for each mattress:
🔗 Helpful Internal Links
- Read our Casper Mattress Review
- Read our Lull Mattress Review
- See our Best Mattresses Buyer’s Guide
Review was edited on December 30 2025 by Thomas Saunders, Editor of Elite Sleep Reviews.
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