Infrared Sleep Socks | Merino Wool | Clinically Proven Sleep Support

The Sleep Sock Backed by Clinical Research

Accapi Infrared Sleep Socks are the only infrared sleep socks with published clinical evidence — studied in a peer-reviewed trial and shown to significantly reduce insomnia severity and increase slow-wave sleep after just two weeks of nightly use. Made with merino wool and Accapi's proprietary infrared-emitting fiber, these socks work with your body's natural thermoregulation to help you fall asleep faster, sleep more deeply, and wake feeling genuinely restored.

Clinically Studied — Published Results A peer-reviewed study published in the Journal of Sports Medicine and Physical Fitness (May 2025) followed 30 participants over two weeks of nightly use and found:

• Insomnia Severity Index scores dropped significantly, from 10.4 to 5.7
• Slow-wave sleep — the deepest, most restorative sleep stage — increased by an average of 9 minutes per night
• 60% of participants reported no insomnia by the end of the study (vs. 26.6% before)
• More than 8 out of 10 participants would recommend the socks for improving sleep

Read the published study (Bertuccioli A, et al. Evaluation of the effects of a technical sock on sleep dynamics. J Sports Med Phys Fitness. 2025 May 21. DOI: 10.23736/S0022-4707.25.16871-0)

Why Foot Warmth Matters for Sleep Restful sleep depends on your body's ability to regulate its core temperature. As your feet warm, vasodilation occurs — your body dissipates heat and triggers melatonin production, the hormone that governs your sleep-wake cycle. Accapi's infrared fiber maintains foot warmth throughout the night, sustaining the thermoregulatory conditions that promote deeper, less fragmented sleep — something a warm foot bath before bed cannot do.

Merino Wool — Nature's Best Sleep Fiber Merino wool is naturally hygroscopic, absorbing and managing moisture throughout the night to keep feet dry and comfortable. Its natural temperature-regulating properties make it the ideal base for a sleep sock — enhanced further by Accapi's infrared fiber for superior circulation and thermoregulation.

Accapi Infrared Fiber — Enhanced Circulation & Thermoregulation Accapi's infrared-emitting fiber works continuously to enhance peripheral circulation and support the body's natural thermoregulation — helping maintain the foot temperature conditions that promote slow-wave sleep and reduce nighttime awakenings.

No compression. No medication. No effort. Just put them on and sleep better.

Key Features:

• Clinically studied — published in Journal of Sports Medicine & Physical Fitness (2025)
• Reduces insomnia severity — ISI scores dropped from 10.4 to 5.7
• Increases slow-wave sleep — +9 minutes per night on average
• Merino wool for natural moisture management & temperature regulation
• Accapi infrared fiber for enhanced circulation & thermoregulation
• No compression — comfortable all night
• Unisex
• Made in Italy

69% Merino Wool, 20% Polyamide, 6% Silicone, 4% Polyester, 1% Elastane | Made in Italy

Frequently Asked Questions

What did the study actually measure?

A peer-reviewed clinical study published in the Journal of Sports Medicine and Physical Fitness (May 2025) followed 30 participants over two weeks of nightly sock use. Researchers tracked both self-reported insomnia severity (via the Insomnia Severity Index) and objective sleep data recorded by wearable sleep trackers. After two weeks, Insomnia Severity Index scores dropped significantly, from an average of 10.4 to 5.7, and slow-wave sleep — the deepest, most restorative stage of sleep — increased by an average of 9 minutes per night, a statistically significant result.

Is this an independent study?

The study was conducted by independent researchers at the University of Urbino Carlo Bo and approved by the university's ethics committee. As disclosed in the published paper, the lead author serves as a scientific consultant to Bruno Chiaruttini S.r.l., the manufacturer of the tested sock. The authors note this disclosure transparently in the publication, consistent with standard peer-review practice.

Did the study include a control group?

No. The study's authors note this as a limitation of the research: there was no placebo or control group, so the improvements observed cannot be definitively attributed solely to the socks rather than other factors. The authors recommend future studies include a control group to confirm these findings. We believe it's important to share this limitation alongside the results.

How long until I might notice a difference?

In the study, participants wore the socks nightly for two weeks before researchers measured results. Individual experiences may vary, and the socks are not intended to diagnose, treat, or cure insomnia or any other medical condition.

What are sleep socks made of, and how do they work?

Accapi Sleep Socks are made primarily of merino wool, which naturally manages moisture and helps regulate temperature, combined with Accapi's infrared-emitting fiber. The socks work by helping retain warmth in the feet — a mechanism researchers believe may help signal the body's natural sleep processes, without compression or medication.

Can I wash these socks?

Yes, please follow the care instructions on the product label to preserve the merino wool and infrared fiber.