Helix | Midnight w GlacioTex Cooling | 11.5" King Mattress

Gently - Used: This mattress has little to no wear and tear, has been cleaned and sanitized, and will be great  for many years to come. 

The Helix Midnight 11.5″ King is a strong choice for many sleepers looking for a hybrid mattress that offers a comfortable medium feel, solid support, and hybrid construction with decent value. 

Overview & Feel

• The Helix Midnight is a hybrid mattress built for a medium (medium-firm) feel, offering a balance of comfort and support.

• The “11.5”” refers to its height (11.5″) in the Core/Standard version. 

• The King size dimensions are 76″ width × 80″ length × 11.5″ height.

• Suitable for a range of sleeper types: especially back and side sleepers seeking a balanced mattress. According to reviews, it provides good support and pressure relief.

Construction & Materials

• Cover: The mattress uses a breathable knit cover (Light Breathe Knit) designed for comfort and airflow.  In some versions, a GlacioTex™ cooling cover upgrade is available. 

• Comfort Layers: Memory-plus foam layer(s) provide contouring and pressure relief. 

• Hybrid Support Core: Individually-wrapped steel coils form the main support zone, giving responsiveness, motion isolation, and air-flow.

•  Base / Transition: Under the coils and foam layers there is a DuraDense (high-density) foam base layer to stabilise the mattress. 

Key Features & Benefits

• Edge support: Reinforced perimeter support (on many versions) helps reduce sagging and gives a stable edge to lie or sit on. 

• Motion isolation: The hybrid design (foam + coils) helps moderate motion transfer, making it a decent option for couples.

• Temperature regulation: The coil base allows better airflow than all-foam mattresses, and some versions include cooling-cover options for hot sleepers. 

“Specs at a glance” (King size version)

• Size: King (76″ W × 80″ L) 

• Height: 11.5″ (standard Core version)

• Construction: Hybrid (Memory foam / poly foam comfort + individually wrapped coils + foam base) 

• .Feel: Medium to medium-firm (about 6/10 on a 1–10 scale, depending on sleeper and version) Weight (approximate): For the King version, one retailer lists ~120 lbs