memory foam twin mattress

Standard Twin memory foam mattresses are typically 39 x 75 inches; Twin XL options are typically 39 x 80 inches.

Common thicknesses listed for twin memory foam mattresses include 8, 10, 12, and 14 inches.

Listings show memory foam and gel- or gel-infused foam layers, high-density foam support cores, hybrid constructions with pocketed or encapsulated coils, and combinations such as gel memory foam over a high-density core foam.

Firmness options vary and commonly include Firm, Medium-Firm, Medium (sometimes labeled Medium-Plush), and some models offer dual-sided or reversible firm/soft configurations.

Most are shipped compressed, rolled, or boxed as "mattress-in-a-box." Expansion times commonly range from about 24 to 72 hours, with some listings recommending up to 72 hours for full expansion.

Common advertised benefits include pressure relief and body-contouring from memory foam, plus good motion isolation to reduce partner disturbance.