Twin XL Mattresses ⁽²⁴⁾

Twin XL mattresses (38" x 80") offer 5 extra inches of length compared to a standard twin — perfect for taller sleepers, college dorms, and adjustable bed frames. Browse hybrid, memory foam, and innerspring Twin XL options from trusted brands at factory-direct prices with free local delivery in the LA area.

Twin XL is also the building block of a split king: two Twin XL mattresses side by side equal one king. That makes it the most versatile size in the store — a guest room solution today can become half of an adjustable king setup later. Compare all sizes in our mattress dimensions guide.

Twin XL Mattress FAQs

What are Twin XL mattress dimensions?

A Twin XL measures 38 inches wide by 80 inches long — the same width as a standard twin, but 5 inches longer, matching the length of a queen or king.

Is a Twin XL big enough for an adult?

Yes — the 80-inch length fits most adults comfortably. It's the standard dorm size and a popular pick for single sleepers in smaller rooms and for adjustable bases.

Do two Twin XL mattresses make a king?

Exactly — two Twin XLs (38" x 80" each) side by side create a 76" x 80" surface, identical to a standard king. That's what a split king is.

Will my twin sheets fit a Twin XL?

No — the extra length means you'll want dedicated Twin XL sheets for a proper fit.