Ice retention is easy to promise and harder to deliver. Anyone can toss a few drinks into a cooler for an afternoon. The real test is opening it a day or two later and finding the ice still doing its job.
HYPERCOLD insulation is the reason CORE's CLIMAKEEP coolers deliver that kind of retention without the weight and bulk of a hard-sided cooler. Here is how the system works, what makes high-density EVA foam different from standard cooler insulation, and which CLIMAKEEP model is right for you.
What Is HYPERCOLD Insulation?
HYPERCOLD is CORE's multi-layer cooler insulation system. Two materials work together to slow heat transfer and keep contents cold longer:
- High-Density EVA Foam: A thicker, denser version of the foam found in standard soft coolers. Acts as the primary thermal barrier between the cooler’s exterior and interior walls.
- Reflective PET Film Liner: A heat-reflective layer bonded to the interior. Bounces cold air back toward the contents instead of letting cold air absorb into the foam walls.
By combining these 2 insulation types, HYPERCOLD targets heat from two directions. EVA foam slows heat coming in from the outside, while the reflective liner prevents cold from escaping toward the walls.
How EVA Foam Cooler Insulation Works
EVA (ethylene-vinyl acetate) is a closed-cell foam used in athletic shoes, yoga mats, and protective gear. Closed-cell means the foam contains no open pores for air or moisture to pass through, which makes the material naturally insulating and water-resistant.
Why Density Matters
Not all EVA foam performs the same. The key variable is density:
- Low-density EVA: Lighter and more flexible. Found in budget soft coolers. Provides basic insulation but breaks down faster under sustained heat.
- High-density EVA: Heavier and more rigid. Blocks heat transfer more effectively because the denser cell structure creates a stronger thermal barrier.
HYPERCOLD uses high-density EVA throughout the walls, lid, and base of every CLIMAKEEP cooler. No thin spots or shortcuts on the bottom panel where the cooler sits on a hot surface.
The Role of the Reflective Liner
Standard soft coolers rely on foam alone. HYPERCOLD adds a reflective PET film layer that works like insulation in a building wall. The film reflects radiant cold back into the cooler interior, reducing the rate at which the foam absorbs cold energy from the contents.
The practical effect: ice lasts longer per load, and the cooler recovers faster after each lid opening.
HYPERCOLD vs. Standard Soft Cooler Insulation
Not all soft coolers are built with the same materials, and those differences have a direct impact on how long ice lasts.
| Feature | HYPERCOLD (CLIMAKEEP) | Standard Soft Cooler |
|---|---|---|
| Foam Type | High-density EVA | Low to mid-density foam |
| Reflective Layer | PET film liner (heat-reflective) | None on most models |
| Ice Retention | 2 to 3 days | 12 to 18 hours |
| Wall Coverage | Full walls, lid, and base | Often thinner on base and lid |
| Construction | Fully welded, leakproof seams | Stitched seams (leak-prone) |
The difference is most noticeable on multi-hour outings and overnight camping trips. A budget cooler works fine for a quick lunch run. For a full day at a tailgate, a beach trip, or a weekend at the campsite, HYPERCOLD holds cold measurably longer.
Ice Retention Across the CLIMAKEEP Lineup
Every CLIMAKEEP cooler uses the same HYPERCOLD insulation system. The difference in retention time comes down to cooler volume, since larger coolers hold more ice mass.
- 12 Can CLIMAKEEP: Up to 2 days. Best for solo outings, day hikes, and short trips.
- 18 Can CLIMAKEEP: Up to 2 days. Box-style design for couples and small group day trips.
- 24 Can Backpack: Up to 3 days. Hands-free carrying for festivals, hiking, and longer outings.
- 36 Can CLIMAKEEP: Up to 3 days. Full weekend capacity for group camping and all-day events.
All four pairs are HYPERCOLD with MagSnap magnetic closure and fully welded, leakproof construction.
Tips to Maximize Ice Retention
Even premium cooler insulation performs better with a few simple habits:
- Pre-chill before loading: Drop a bag of ice inside 30 minutes before packing. Cooling the foam walls first means less ice melts on contact.
- Use a mix of ice and frozen packs: Build a foundation of ice packs and fill in gaps between items with smaller ice cubes.
- Start with cold contents: Never put warm food in a cooler to cool down. Pre-chilling drinks and food before loading reduces the thermal load on the ice.
- Keep the cooler in shade: Direct sun accelerates heat transfer through any insulation. Shade extends performance significantly.
- Minimize lid openings: The MagSnap seal helps with automatic closure, so you won’t forget to close your cooler.
Cold That Lasts as Long as the Trip
HYPERCOLD insulation turns a soft cooler from a "keep drinks cool for a few hours" solution into genuine multi-day cold storage. The high-density EVA foam blocks heat coming in, the reflective liner keeps cold from leaking out, and the welded construction ensures nothing drips through the seams.
Browse the full CORE's CLIMAKEEP collection to compare sizes, colors, and capacities, and choose the cooler that fits your next outing. Whether you're packing for a quick day trip or a full weekend away, longer-lasting ice means one less thing to think about once you get there.
FAQs
What is HYPERCOLD insulation?
HYPERCOLD is CORE's multi-layer insulation system combining high-density EVA foam with a reflective PET film liner to block heat and retain cold.
How long do CLIMAKEEP coolers hold ice?
The 12 and 18 can models hold ice for up to two days. The 24 can backpack, and the 36 can models retain ice up to three days.
What is EVA foam in a cooler?
EVA (ethylene-vinyl acetate) is a closed-cell foam that naturally insulates and resists moisture. High-density EVA provides stronger thermal protection than standard foam.
How do you make ice last longer in a soft cooler?
Pre-chill the cooler, use block ice or frozen packs, start with cold contents, keep the cooler in shade, and minimize how often the lid opens.
Are CLIMAKEEP coolers better than hard coolers for ice retention?
Hard coolers with thick walls can match or exceed soft cooler retention. CLIMAKEEP offers comparable 2 to 3 day performance at a fraction of the weight.
Can you use HYPERCOLD coolers for hot food?
The insulation works in both directions and can keep warm food warm for a few hours, though CLIMAKEEP coolers are primarily designed for cold retention.
