Twin Mattress Size Guide
The Twin is the smallest standard mattress size — ideal for children, bunk beds, and tight spaces. At 38 inches wide, it works well for a single child or small adult.
About the Twin Size
The Twin mattress is 38 inches wide by 75 inches long, making it the smallest standard size in the US market. It's the most common choice for children's bedrooms, bunk beds, and loft beds where space is a primary constraint. For children up to about age 10, a Twin provides ample room. Taller children or those who tend to sprawl while sleeping may benefit from the Twin XL (an additional 5 inches of length). A Twin fits in most rooms, even small spaces — requiring a minimum of about 7×10 feet to allow adequate walking space on the sides. It's also a popular choice for guest rooms in apartments where space is limited. The drawback is that it's too narrow for most adults to sleep comfortably side by side, making it a single-sleeper-only option.
Best For
- ✓Children (ages 3–10)
- ✓Bunk beds and loft beds
- ✓Small bedrooms under 10×10 feet
- ✓Single adults in studio apartments
- ✓Guest rooms
Not Ideal For
- ✗Adults over 6 feet tall (choose Twin XL)
- ✗Couples
- ✗Anyone who moves a lot during sleep
Top Mattresses Available in Twin
Best for: Budget shoppers · Guest rooms
Why it stands out: Individually encased springs add support and airflow
Keep in mind: The 8-inch profile provides less cushioning than taller hybrids
Best for: Budget shoppers · Back sleepers
Why it stands out: Cooling gel Memory Foam and a cool-to-touch top fabric
Keep in mind: Firm feel provides less cushioning than the taller Relax and Supreme
Best for: Budget shoppers · Back sleepers
Why it stands out: Low current pricing for a foam-and-coil hybrid
Keep in mind: This legacy route represents the same current Walmart item as the 10-inch Hybrid catalog row
Best for: Budget shoppers · Side sleepers
Why it stands out: Three-inch memory-foam comfort layer gives the Medium more contouring than a thin budget foam bed
Keep in mind: Deep memory-foam contouring can feel slower to move on than a hybrid
Buy with confidence
Try Lucid's current 10-inch Medium at home for 100 nights at Lucid
Best for: Side sleepers · Back sleepers
Why it stands out: Cool-to-touch top panel and three-zone foam
Keep in mind: Exact foam densities and cover fiber content are not published
Best for: Value focused shoppers who want a conventional medium firm memory foam feel · Back and stomach sleepers who do not need an extra firm surface
Why it stands out: Certification scope is specific: CertiPUR-US covers the foam layers and OEKO-TEX STANDARD 100 covers only the knit cover; Bare Home separately states that the mattress is fiberglass-free
Keep in mind: Only one feel is offered, and Bare Home itself says lighter side sleepers may prefer something softer
Buy with confidence
100-night Good Dreams comfort trial at Bare Home
Twin Size — Frequently Asked Questions
Is a Twin long enough for adults?
At 75 inches, a Twin accommodates adults up to about 5'9". If you're taller, the Twin XL (80 inches long) is the better choice. Most adults find the 38-inch width uncomfortable for sleeping alone long-term unless they're petite or the room doesn't allow a wider option.
What sheets fit a Twin mattress?
Standard Twin sheets (38×75 inches) with a deep pocket of 10–16 inches fit most Twin mattresses. Check your mattress height — mattresses over 12 inches need deep-pocket or extra-deep-pocket sheets.
Can a Twin mattress fit two people?
A Twin is too narrow for two adults to sleep comfortably side by side. Two small children can share a Twin short-term, but for comfortable co-sleeping, a Full or larger is strongly recommended.
What bed frame fits a Twin mattress?
Standard Twin frames are widely available from budget options (~$100) to premium platform frames. Bunk beds are always Twin size. IKEA, Amazon, and most furniture retailers carry the widest selection.
Is Twin the same as Single?
Yes — Twin and Single refer to the same size (38×75 inches). 'Single' is an older term still used in some contexts; 'Twin' is the standard industry term in the US today.