Full, Memory Foam, Under 8 in
Mattresses under $50
18 mattresses under $50 from Ftopbtb and Auruge. Most cost $40 to $42, and half cost less than $40.
+Full size fits many standard beds
+Cooling memory foam
+Medium firm support for pressure relief
−Under 8 inches thick, thinner than typical mattresses
$39.99
as of 11/04/2026 09:41 PST - DetailsProduct details
4 Inch Full Mattress with Cooling Memory Foam, Full Size Mattress in a Box | Medium Firm for Support & Pressure Relief,
$39.99as of 11/04/2026 09:41 PST - Details
View on AmazonPros
+Full size fits many standard beds
+Cooling memory foam
+Medium firm support for pressure relief
+Ships boxed for easy home delivery
Cons−Under 8 inches thick, thinner than typical mattresses
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Medium Firm, Under 8 in
+Cooling foam and breathable comfort layer
+Memory foam construction
+Medium firm feel for pressure relief
−Under 8 inches thick, thinner than typical mattresses
$39.89
as of 11/04/2026 10:36 PST - DetailsProduct details
6 Inch Twin Size Mattress, Twin Memory Foam Mattress with Cooling Foam & Breathable Comfort Layer, Pressure Relief
$39.89as of 11/04/2026 10:36 PST - Details
View on AmazonPros
+Cooling foam and breathable comfort layer
+Memory foam construction
+Medium firm feel for pressure relief
+Twin size fits single beds
+Ships boxed for easy home delivery
Cons−Under 8 inches thick, thinner than typical mattresses
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Under 8 in
+Twin size fits single beds and small rooms
+Gel memory foam with a cooling design
+CertiPUR certified foam
−Thickness is under 8 inches, thinner than typical mattresses
$39.89
as of 11/03/2026 23:02 PST - DetailsProduct details
FTOPBTB Twin Size Mattress, 6 Inch Gel Memory Foam Mattress in a Box, Fiberglass Free, Breathable for Cooler Sleep
$39.89as of 11/03/2026 23:02 PST - Details
View on AmazonPros
+Twin size fits single beds and small rooms
+Gel memory foam with a cooling design
+CertiPUR certified foam
+Ships boxed for easy delivery
+Fiberglass free construction
Cons−Thickness is under 8 inches, thinner than typical mattresses
How pros and cons are picked (About: Disclaimer)About this product
Full, Memory Foam, Medium Firm, Under 8 in
+Full size fits standard full beds
+Green tea gel cooling design
+CertiPUR certified foam
−Only 4 inches thick, thinner than typical mattresses
$42.99
as of 11/03/2026 23:04 PST - DetailsProduct details
Full Size Memory Foam Mattresses, 4 Inch Mattress in A Box with Cooling Green Tea Gel with Fiberglass Free, Medium
$42.99as of 11/03/2026 23:04 PST - Details
View on AmazonPros
+Full size fits standard full beds
+Green tea gel cooling design
+CertiPUR certified foam
+Medium firm feel
+Ships boxed for easy delivery
Cons−Only 4 inches thick, thinner than typical mattresses
How pros and cons are picked (About: Disclaimer)About this product
Full, Memory Foam
+Full size fits standard full beds
+Memory foam conforms to the body
+Two inch thickness folds for compact storage
−Two inch thickness provides limited support for daily sleeping
$35.50
as of 11/03/2026 23:04 PST - DetailsProduct details
Full 2 Inch Fold Guest Bed Memory Foam Mattress
$35.50as of 11/03/2026 23:04 PST - Details
View on AmazonPros
+Full size fits standard full beds
+Memory foam conforms to the body
+Two inch thickness folds for compact storage
Cons−Two inch thickness provides limited support for daily sleeping
Compared with the 18 mattresses on this page−Cooling not listed: 17 of the 28 here list one
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Medium Firm, Under 8 in
+Twin size fits standard twin bed frames
+CertiPUR-US certified foam
+Memory foam conforms to the body's shape
−Thin 6-inch profile offers less cushioning
$39.99
as of 11/03/2026 23:02 PST - DetailsTwin, Memory Foam, Medium Firm, Under 8 in
+CertiPUR-US certified foam
+Cooling gel memory foam layer
+Medium firm feel
−Thin profile offers less cushioning than thicker mattresses
$39.89
as of 11/04/2026 08:42 PST - DetailsProduct details
YskdhfczQ Twin Size Mattress, 6 Inch Twin Gel Memory Foam Mattress for Pressure Relief & Cool Comfort Sleep, Medium
$39.89as of 11/04/2026 08:42 PST - Details
View on AmazonPros
+CertiPUR-US certified foam
+Cooling gel memory foam layer
+Medium firm feel
+Ships boxed for easy home delivery
+Thin 6 inch profile suits low bed frames
Cons−Thin profile offers less cushioning than thicker mattresses
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Medium Firm, Under 8 in
+CertiPUR-US certified foam
+Cooling gel memory foam layer
+Medium firm feel
−Thin profile offers less cushioning than thicker mattresses
$39.89
as of 11/04/2026 08:42 PST - DetailsProduct details
YskdhfczQ 6 Inch Twin Mattress, Gel Memory Foam Mattress in a Box for Cooling Night Sleep & Pressure Relief, Medium
$39.89as of 11/04/2026 08:42 PST - Details
View on AmazonPros
+CertiPUR-US certified foam
+Cooling gel memory foam layer
+Medium firm feel
+Ships boxed for easy home delivery
+Thin 6 inch profile suits low bed frames
Cons−Thin profile offers less cushioning than thicker mattresses
How pros and cons are picked (About: Disclaimer)About this product
Full, Memory Foam, Under 8 in
+Full size replaces standard pull-out sofa mattresses
+Gel memory foam construction for contouring support
+Four inch profile suits sleeper sofas
−Thin four inch profile offers less cushioning than thicker mattresses
$29.89
as of 11/04/2026 09:41 PST - DetailsProduct details
4 Inch Sofa Mattress Full Size, Replace Pull Out Sofa Full Mattress | Gel Memory Foam Mattress Replacement for Sleeper
$29.89as of 11/04/2026 09:41 PST - Details
View on AmazonPros
+Full size replaces standard pull-out sofa mattresses
+Gel memory foam construction for contouring support
+Four inch profile suits sleeper sofas
Cons−Thin four inch profile offers less cushioning than thicker mattresses
Compared with the 18 mattresses on this page−Cooling not listed: 17 of the 28 here list one
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Under 8 in
+Twin size fits single beds and small rooms
+Gel memory foam construction
+Medium firm feel
−Thin at under 8 inches
$39.89
as of 11/04/2026 00:19 PST - DetailsProduct details
MTSVMP Twin Size Mattress, 6 Inch Gel Memory Foam Mattress in a Box, Fiberglass Free Medium Firm Mattresses for
$39.89as of 11/04/2026 00:19 PST - Details
View on AmazonPros
+Twin size fits single beds and small rooms
+Gel memory foam construction
+Medium firm feel
+Ships boxed for easy delivery
+Fiberglass free construction
Cons−Thin at under 8 inches
Compared with the 18 mattresses on this page−Cooling not listed: 17 of the 28 here list one
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Medium Firm, Under 8 in
+Green tea gel memory foam
+Removable washable cover
+Ships boxed for easy delivery
−Under 8 inches thick, thinner than most memory foam mattresses
$42.69
as of 11/04/2026 12:38 PST - DetailsProduct details
auruge Twin 6 Inch Green Tea Gel Memory Foam Mattress in a Box, Medium Firm | Removable washable cover |
$42.69as of 11/04/2026 12:38 PST - Details
View on AmazonPros
+Green tea gel memory foam
+Removable washable cover
+Ships boxed for easy delivery
+Twin size fits single beds and small rooms
Cons−Under 8 inches thick, thinner than most memory foam mattresses
Compared with the 18 mattresses on this page−Cooling not listed: 17 of the 28 here list one
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Under 8 in
+CertiPUR certified foam for lower chemical emissions
+Cooling feature listed for a cooler sleep surface
+Breathable design listed for airflow
−Under 8 inch thickness is thinner than typical twin mattresses
$39.89
as of 11/04/2026 00:44 PST - DetailsTwin, Memory Foam, Medium Firm, Under 8 in
+CertiPUR-US certified memory foam
+Cooling green tea gel layer
+Medium firm feel for pressure relief
−Under 8 inches thick, thinner than typical mattresses
$39.89
as of 11/04/2026 10:36 PST - DetailsProduct details
6 Inch Twin Mattress | Gel Memory Foam Mattress in a Box with Cooling Green Tea Gel | Medium Firm | Pressure Relief &
$39.89as of 11/04/2026 10:36 PST - Details
View on AmazonPros
+CertiPUR-US certified memory foam
+Cooling green tea gel layer
+Medium firm feel for pressure relief
+Twin size fits single beds and bunk beds
+Ships boxed for easy home delivery
Cons−Under 8 inches thick, thinner than typical mattresses
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Medium Firm, Under 8 in
+Twin size fits single beds and small rooms
+CertiPUR-US certified memory foam
+Cooling gel memory foam for a cool sleep surface
−Thin at under 8 inches
−Thin profile offers less cushioning than thicker mattresses
$39.99
as of 11/04/2026 00:19 PST - DetailsTwin, Memory Foam, Medium Firm, Under 8 in
+Twin size fits single beds and small rooms
+CertiPUR-US certified memory foam
+Cooling gel memory foam construction
−Thin at under 8 inches
−Thin profile offers less cushioning than thicker mattresses
$39.89
as of 11/04/2026 00:19 PST - DetailsProduct details
MTSVMP 6 Inch Twin Mattress, Gel Memory Foam Mattress in a Box with Green Tea Gel, Medium Firm, Pressure Relief &
$39.89as of 11/04/2026 00:19 PST - Details
View on AmazonPros
+Twin size fits single beds and small rooms
+CertiPUR-US certified memory foam
+Cooling gel memory foam construction
+Medium firm feel for side and back sleepers
+Ships boxed for easy delivery
Cons−Thin at under 8 inches
−Thin profile offers less cushioning than thicker mattresses
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Medium Firm, Under 8 in
+Cooling feature listed for a warmer sleep
+Memory foam conforms to the body for pressure relief
+Ships boxed for easy home delivery
−Under 8 inch thickness is thinner than typical twin mattresses
$39.89
as of 11/04/2026 00:29 PST - DetailsProduct details
NXZMDEMY Twin Mattress, 6 Inch Gel Memory Foam Twin Mattress in a Box | Cooling Comfort Support & Pressure Relief,
$39.89as of 11/04/2026 00:29 PST - Details
View on AmazonPros
+Cooling feature listed for a warmer sleep
+Memory foam conforms to the body for pressure relief
+Ships boxed for easy home delivery
+Medium firm feel suits side and back sleepers
Cons−Under 8 inch thickness is thinner than typical twin mattresses
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Medium Firm, Under 8 in
+High-density charcoal-infused memory foam
+Medium firm spine and back support
+Twin size fits single beds
−Under 8 inches thick, thinner than typical mattresses
$42.51
as of 11/04/2026 10:36 PST - DetailsProduct details
6" Twin High-Density Charcoal-Infused Memory Foam Mattress | Medium Firm, Spine and Back Support, Pressure Relief,
$42.51as of 11/04/2026 10:36 PST - Details
View on AmazonPros
+High-density charcoal-infused memory foam
+Medium firm spine and back support
+Twin size fits single beds
+Ships boxed for easy home delivery
Cons−Under 8 inches thick, thinner than typical mattresses
Compared with the 18 mattresses on this page−Cooling not listed: 17 of the 28 here list one
How pros and cons are picked (About: Disclaimer)About this product
Twin, Memory Foam, Under 8 in
+CertiPUR-US certified foam
+Cooling gel memory foam layer
+Ships boxed for easy home delivery
−Thin profile offers less cushioning than thicker mattresses
$39.89
as of 11/04/2026 08:42 PST - DetailsProduct details
YskdhfczQ 6 Inch Twin Size Mattress, Gel Memory Foam Mattress in a Box | Twin Size Mattress with Cool Gel Memory Foam
$39.89as of 11/04/2026 08:42 PST - Details
View on AmazonPros
+CertiPUR-US certified foam
+Cooling gel memory foam layer
+Ships boxed for easy home delivery
+Thin 6 inch profile suits low bed frames
Cons−Thin profile offers less cushioning than thicker mattresses
How pros and cons are picked (About: Disclaimer)About this product
Compare specs
| mattress | Size | Type | Firmness | Thickness | Spec score | Price |
|---|---|---|---|---|---|---|
| Full | Memory Foam | Under 8 in | n/a | $39.99 as of 11/04/2026 09:41 PST - Details | ||
| Twin | Memory Foam | Medium Firm | Under 8 in | n/a | $39.89 as of 11/04/2026 10:36 PST - Details | |
| Twin | Memory Foam | Under 8 in | n/a | $39.89 as of 11/03/2026 23:02 PST - Details | ||
| Full | Memory Foam | Medium Firm | Under 8 in | n/a | $42.99 as of 11/03/2026 23:04 PST - Details | |
| Full | Memory Foam | n/a | $35.50 as of 11/03/2026 23:04 PST - Details | |||
| Twin | Memory Foam | Medium Firm | Under 8 in | n/a | $39.99 as of 11/03/2026 23:02 PST - Details | |
| Twin | Memory Foam | Medium Firm | Under 8 in | n/a | $39.89 as of 11/04/2026 08:42 PST - Details | |
| Twin | Memory Foam | Medium Firm | Under 8 in | n/a | $39.89 as of 11/04/2026 08:42 PST - Details | |
| Full | Memory Foam | Under 8 in | n/a | $29.89 as of 11/04/2026 09:41 PST - Details | ||
| Twin | Memory Foam | Under 8 in | n/a | $39.89 as of 11/04/2026 00:19 PST - Details |
Before you buy
- Mattress Types and Thickness, Explained
- Mattress Firmness Labels, Explained
- Mattress Firm Return Policy and Sleep Trial
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