RevX X Tub + LUX

The X Tub + LUX is built for daily cold exposure — not the once-a-month influencer photoshoot, but the protocols you actually run.

Built deep. 34" of acrylic — the deepest acrylic tub on the market. Full above-the-shoulder submersion while sitting upright. No crouching, no half-submersion compromise.

Built cold. Three-inch foam-insulated walls. The 1.5 HP LUX chiller drives water down to 34°F and holds it. Adjustable jets disrupt the thermal boundary layer that forms around your body during a static sit — the same boundary that lets the skin acclimate and makes the plunge feel "easy" after 90 seconds. The jets keep the stimulus honest.

Built across the temperature range. The 1.5 HP LUX chiller drives water down to 34°F or up to 104°F. You decide what your tub is for on a given day — cold protocol or warm soak. The wide range lets you experiment with what works for your physiology. (Note: true contrast therapy — alternating cold and hot within a single session — requires a separate heat source like a sauna. The LUX can be set to either temperature on demand, but not both within minutes. We say this directly because the published contrast therapy research uses alternating immersion within a session, not single-machine cold-on-day-X / heat-on-day-Y.)

Worth knowing before you buy. If you run cold exposure immediately after resistance training, Roberts et al. (2015) [evidence: [B] trending [A], multiple replications] documented attenuated hypertrophy gains. Time your cold sessions away from hypertrophy days — most protocols suggest 4–6 hours minimum separation, ideally a full day.

Worth knowing before you buy (contraindications). Cold-water immersion is not appropriate for everyone. If you have unstable angina, severe coronary artery disease, untreated arrhythmias, uncontrolled hypertension, active anticoagulation, cold urticaria, Raynaud's phenomenon, or you're pregnant (especially first trimester), consult your physician before starting a cold protocol. Standard rheumatology guidance for Raynaud's is to AVOID acute cold exposure, not graduated-exposure-therapy. The cold-shock response in the first 30–60 seconds is the highest-risk window for cardiac events in pre-existing CV disease.

What's included:

• X Tub (acrylic, 34"+ depth, 3" foam insulation)
• LUX High Performance Chiller and Filtration System (1.5 HP)
• 3-year limited warranty

For the people who treat hormesis as a daily practice, not a content opportunity.

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