Cold. Precise. Built to last. The Cuboid XL is cold therapy done right.

The Golden Designs Cuboid XL Cold Plunge Tub is engineered for serious recovery. Built with a 304 nano-coated stainless steel interior and a Pacific Cedar-trimmed exterior, this XL tub delivers the cold immersion experience that elite athletes and wellness-focused homeowners demand — in a form that looks as premium as it performs.

At 55"L × 32.5"W × 31.5"H overall with a spacious 48.5"L × 26"W × 28.5"H interior, the Cuboid XL provides generous room for full-body immersion. The nano-coating on the stainless steel interior resists corrosion and maintains a sleek, hygienic surface session after session. The Pacific Cedar step ensures safe, comfortable entry and exit, while the custom cover with child safety latches keeps the tub secure when not in use.

Cold water immersion is one of the most evidence-backed recovery modalities available — accelerating muscle recovery, reducing inflammation, boosting circulation, and supporting overall well-being. The Cuboid XL is the infrastructure that makes it a daily practice.

Please note: A chiller is required for cold water temperature control and is sold separately. This listing is for the tub only.

Features & Specifications

• Interior: 304 nano-coated stainless steel — corrosion-resistant, hygienic, premium finish
• Exterior: Nano-coated stainless steel cabinet with Pacific Cedar trim
• Overall dimensions (L×W×H): 55" × 32.5" × 31.5"
• Interior dimensions (L×W×H): 48.5" × 26" × 28.5"
• Entry: Pacific Cedar step included
• Cover: Custom cover with child safety latches included
• Chiller: Sold separately — required for temperature control
• Use: Indoor or outdoor
• Warranty: 1-year limited warranty

Frequently Asked Questions

What is the difference between the Cuboid XL and the standard Cuboid?
The Cuboid XL has a 304 nano-coated stainless steel interior vs the standard Cuboid's PVC interior, and a larger footprint (48.5"L × 26"W interior vs 43.5"L × 24"W). Stainless steel is more durable and easier to sanitize than PVC, but PVC insulates cold temperature more efficiently. The XL is priced at $5,999 vs $4,999 for the standard Cuboid. Choose the XL for a premium stainless interior and more room; choose the standard Cuboid for better cold retention and a lower price.

What is 304 nano-coated stainless steel?
304 stainless steel is a food-grade, corrosion-resistant alloy widely used in premium wellness and food service applications. The nano-coating adds an additional layer of protection against oxidation, mineral deposits, and surface staining — keeping the interior looking clean and performing hygienically over years of daily use. It's the same grade of stainless used in high-end hot tubs and commercial kitchen equipment.

Does the Cuboid XL come with a chiller?
No — the chiller is sold separately. This listing is for the tub only. The optional Cold Therapy Premier Chiller (0.8 HP, WiFi app control) cools the water to 37°F and also includes a heat function. We strongly recommend adding the chiller to your order — without it, you'll need to manually add ice to cool the water.

What are the benefits of cold water immersion?
Cold water immersion reduces muscle soreness and inflammation, accelerates post-workout recovery, boosts circulation, supports immune function, and triggers norepinephrine release — associated with improved mood, focus, and energy. Many users report significant mental clarity and stress reduction with consistent daily practice.

What temperature should I target for cold plunging?
Most cold therapy protocols recommend 50–59°F (10–15°C) for general recovery. More advanced users may go as low as 37–45°F. The optional chiller cools to 37°F, giving you full control. Start warmer and work your way down as your body adapts.

Can the Cuboid XL be used outdoors year-round?
Yes. The nano-coated stainless steel exterior and Pacific Cedar trim are both weather-resistant and suitable for outdoor installation. In freezing climates, the chiller's heat function can prevent the water from freezing and maintain a consistent temperature year-round.

How do I maintain the Cuboid XL?
Regular water treatment (similar to a hot tub) is recommended to keep the water clean between sessions. The 304 stainless steel interior is non-porous and easy to wipe down. The cover with child safety latches keeps debris out when not in use. Drain and refill periodically based on usage frequency.

How is the Cuboid XL delivered?
The Cuboid XL is delivered curbside via freight. Please ensure adequate access for freight delivery and have assistance available to move the tub to its final location. No electrical connection is required for the tub itself — the optional chiller requires a standard electrical outlet.

Why Havenscape Outdoors

At Havenscape Outdoors, we believe recovery is part of the performance. The Golden Designs Cuboid XL is built for those who take both seriously — a cold plunge tub that earns its place in any premium wellness space. Shop with free nationwide shipping and Shop Pay Installments available at checkout.

Delivered curbside. Contact us to coordinate your delivery window.

Complete Your Contrast-Therapy Space

Cold immersion is only half the equation. Pair this cold plunge with a sauna to build a complete contrast therapy ritual — heat your body deeply, then plunge. The cycle between extremes is where recovery, clarity, and resilience are built.

Recommended sauna pairings:

• Orivon Wellness Auris Two 3–4 Person Outdoor Sauna — Premium red cedar, traditional Finnish-style. Built for permanent outdoor installation.
• Dynamic Santorini 1–2 Person Full Spectrum Infrared Sauna — Compact infrared option ideal for indoor contrast therapy setups.
• The Visby Hybrid Sauna — Full spectrum infrared meets traditional Finnish in one unit.

Shop the full Contrast Therapy Space collection →

Upgrade Your Cold Plunge with Active Chilling

A cold plunge tub without a chiller relies on ice — which means constant restocking, inconsistent temperatures, and a lot of effort between sessions. Add a chiller and your tub becomes a true recovery system: set your target temperature, walk away, and plunge whenever you're ready.

Compatible chillers for this tub:

• Golden Designs Cold Therapy Premier Chiller — WiFi app control, dual cold & heat modes. The most capable chiller in our lineup for serious daily use.
• Lumina Cold Plunge Dual Chiller & Heater 1HP — Reliable 1HP active chilling with heating capability. Plug-and-play compatible with most cold plunge tubs.

Not sure which chiller fits your tub? Browse the full Contrast Therapy Space collection or reach out — we'll help you match the right setup.