Drug-free · Peer-reviewed mechanism

The wearable built for the way cramps actually work.

Name: DualWave Relief Belt
Brand: Peryode
Availability: InStock
Rating: 4.8 (247 reviews)

Continuous heat at 38–45°C plus calibrated vibration. Two physiological angles attacking the Prostaglandin Lockdown at once.

★★★★★ 4.8/5 from 247 verified buyers Read reviews

Starter

Belt + USB-C cable + Quick Start Guide

£59.99

For the woman who's tried everything else.

91s

Therapeutic temperature in 91 seconds.

PTC ceramic heats faster than your kettle. Most users feel relief before they finish putting it on.

5h 07m

Battery that lasts a full Day One.

Independently tested runtime on heat-only mode at 38°C. Charges back to full in roughly 2 hours via USB-C.

4mm

Discreet under any clothing.

Wearable to job interviews, weddings, presentations. Reviewers consistently say "nobody noticed."

60d

One email if it doesn't work.

No forms, no photos, no return shipping. Refund processed within 48 hours. We document the SOP on video.

A note from the founder

I built Peryode because nothing on the shelf actually worked for me.

I tried the heating pad. The patches. 800mg of ibuprofen taken too often for too many years. The viral TENS device that stopped working after six weeks while the company stopped responding to emails.

The science showed me what was happening. Period cramps aren't just muscle contractions. Prostaglandin F2-alpha forces uterine hypercontraction and constricts the vessels feeding oxygen to the muscle. Nothing I owned addressed both at once.

So I worked with engineers and obstetric researchers to build the wearable that did. PTC ceramic heat at 38–45°C, the temperature peer-reviewed to match ibuprofen efficacy in 2018. Calibrated vibration that closes the gate on the pain signal at the spinal cord. Two mechanisms. One belt. Built once, kept for years.

We don't take subscriptions. We don't lock you into refills. If it doesn't work for you, one email gets your money back in 48 hours. No return shipping. We mean it because the women who came before you were owed it.

Margot Ellis

Founder · Peryode

What arrives in the box

Engineered, considered, shipped quietly.

Every kit nests in molded recycled paper pulp. The card, the seal, the belt. No plastic, no air-filled wasted space, no marketing leaflets.

Starter

£59.99

DualWave Relief Belt
USB-C charging cable
Quick Start Guide
60-Day Promise card

Three steps. Twelve minutes from box to relief.

Charge for two hours.

USB-C cable into any phone charger. Single charge runs 5h 07m on heat-only mode. About a full Day One.

Wrap, fasten, click on.

Adjustable strap fits 24–46 inch waists. 4mm profile wears flat under any shirt or dress. No gel, no spray, no setup.

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38°C in ninety-one seconds.

Tap up to 45°C. Add NeuroWave vibration on hard days. Three intensity levels, two pulse patterns. Walk around. Forget you have it on.

Heat reopens the constricted vessels.
Vibration closes the gate on the pain signal.

A heating pad fights the muscle. Ibuprofen blocks the chemical. Neither restores blood flow. Peryode addresses the muscle, the vessel, and the nerve gate in one wearable. That's the difference reviewers describe as "finally something that works on the days nothing usually does."

The peer-reviewed evidence

Heat at 38–45°C continuous
matched ibuprofen for primary dysmenorrhea.

A 2018 meta-analysis published in Nature Scientific Reports reviewed three randomized controlled trials. Combined sample: 274 women. The finding wasn't "comparable" or "similar." It was equivalent.

38–45°C

Peer-reviewed therapeutic range

91s

Time to therapeutic temperature

5h07m

Single-charge runtime, heat mode

n=274

Women in Nature 2018 meta-analysis

Jo, J., & Lee, S. H. (2018). Heat therapy for primary dysmenorrhea: a systematic review and meta-analysis. Scientific Reports, 8, 16252.

Versus everything you've tried

Why the alternatives fight half the battle.

	Heating Pad	Heat Patches	Ibuprofen	TENS Device	Peryode
Holds 38–45°C continuous	—	~30 min	N/A	No heat	5h 07m
Restores blood flow	Partial	Partial	—	—	✓
Blocks pain signal	—	—	Indirect	✓	✓
Wearable to work	—	✓	N/A	✓	✓
Side effects	None	Skin irritation	GI / kidney load	None	None
Cost over 2 years	£25	£190	£80 + risk	£119+	£74.99 once

From verified buyers

Real cycles. Real reviews.

★★★★★

4.8/5

247 verified buyers 92% would recommend to a friend

Functional Sufferer · 32

"First period in eight years where I made it through the workday without the bathroom-floor moment."

Had it on under a blazer in a pitch meeting. Nobody noticed. I just sat there feeling functional for the first time in a long time. The 91-second claim is real.

— Verified buyer, London

Endo Warrior · 29

"Stage 4 endo. Nothing eliminates my pain. This made me functional during my worst days. That's the most honest thing I can say."

I'm not going to overclaim. It didn't take everything away. But it took the edge off enough that I could work, eat, sleep. For me that's enormous. Refund policy made me trust ordering.

— Verified buyer, Manchester

TENS Refugee · 34

"I tried the popular TENS device. Didn't work. I assumed nothing would. Heat at 38°C does something different."

The TENS thing felt like a buzzy distraction. This actually addresses the deep cramping. I think it's the heat that does the heavy lifting. Either way, it's the first wearable I've kept past month two.

— Verified buyer, Edinburgh

Gift Receiver · 27

"My boyfriend bought it after watching me curl up every month. Within fifteen minutes my cramps were gone."

He read the article and ordered it without telling me. Fifteen minutes after I put it on the first time, the cramps were just... reduced. I cried. Best gift anyone has ever given me.

— Verified buyer, Brighton

IUD User · 31

"My IUD made cramps worse for six months. I refused to add hormones. This was the answer."

Got the Mirena in February. Cramps got noticeably worse for the first six months as my doctor warned. I didn't want pills, didn't want to wait it out. The belt cut the worst days roughly in half.

— Verified buyer, Bristol

PCOS · 36

"I've spent more on heating pads in three years than this belt costs once."

PCOS means my cycles are unpredictable and the cramps are sometimes brutal. Counted my ThermaCare receipts last year: £260. The belt has paid for itself in six months and I still own it.

— Verified buyer, Leeds

Community

From @myperyode.

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The 60-Day Relief Promise

Sixty days. One email.
We mean it.

Test it for two full cycles. If it doesn't work for you, the next steps belong to you. No fine print, no return shipping, no follow-up calls.

One email.

No forms, no questionnaires, no "please give it one more month." Reply to your order confirmation or write hello@peryode.com. That's the entire process.

48-hour refund.

Money back to the original payment method within 48 business hours. No "please allow 5–10 business days." We process refunds the same week.

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No return shipping.

Keep the belt. Donate it, gift it to a friend, or recycle it. We don't pay you to mail back a used medical device. That defeats the purpose.

Engineered specifications

The technical receipts.

Heat technology

PTC ceramic, self-regulating

Therapeutic range

38–45°C (100–113°F), peer-reviewed in Nature Scientific Reports, 2018

Time to therapeutic temp

91 seconds from cold start

Battery runtime

5h 07m heat-only · ~3h 30m heat + vibration

Vibration modes

3 intensity levels · 2 pulse patterns (continuous + wave)

Charging

USB-C · ~2 hours full charge · Universal phone charger compatible

Profile

4mm thick · adjustable for 24–46 inch waist

Battery

1500mAh · BMS protection circuit · UN38.3 certified for air travel

Compliance

UKCA · CE · RoHS

Materials

Medical-grade silicone, ABS housing, nylon adjustable strap

In the box

Belt · USB-C cable · Quick start guide · 60-day promise card · Tier-specific extras

Warranty

2-year limited warranty · 60-day full refund

Honest answers, upfront

Questions women have actually asked us.

Will this work if I've tried four other things?

Probably the most asked question we get. The honest answer: 38–45°C continuous heat matched ibuprofen efficacy in peer-reviewed research (Nature 2018, n=274). If your heating pad helped a little, this is the version that doesn't quit at hour two and stays at the right temperature. Gate-control vibration adds a second mechanism your heating pad doesn't have. 60 days risk-free — if it doesn't work for you, full refund in 48 hours.

Is it just a glorified heating pad?

Fair question. A heating pad doesn't hold a calibrated temperature, doesn't stay on you while you walk around, doesn't include vibration. The DualWave Relief Belt does all three because each fixes a different part of the Prostaglandin Lockdown. Heating pad fights the muscle. Peryode fights the muscle, the blood flow, and the pain signal.

I have endometriosis. Will this help?

Many users with endo report going from "nothing touches this" to "I can function on Day One." But we need to be straight: this is not a cure for endometriosis. See your doctor for that. What it is: a tool that addresses the muscular and vascular components of endo cramps without adding pills or hormones. Stage 4 users have given strong reviews specifically because it lets them function on bad days.

£74.99 feels expensive. Is it worth it?

Compared to what? ThermaCare patches: £96/year. Nine days of lost productivity per year (UK median wage): £600+. The math says this pays for itself in six months versus patches alone. Health Cash Plan eligible (Bupa, Simplyhealth) — qualifies as a medical expense. Plus the 60-day refund. The risk is on us, not you.

How discreet is it really?

4mm thick. Matte black. No logos. Wear it under a shirt, a dress, a blazer. Job interviews, flights, weddings, presentations. Reviewers consistently say "nobody noticed." If you can wear a thin belt under your clothes, you can wear this.

What if I have an IUD?

Heat and vibration are external, non-invasive, non-chemical. They don't interact with hormonal IUDs (Mirena, Kyleena, Skyla) or copper IUDs (Paragard). Many of our reviewers got it specifically because IUDs gave them worse cramps and they wanted drug-free relief that doesn't interfere. Always confirm with your doctor if you have specific concerns.

I'm postpartum. Is it safe?

It's drug-free, doesn't enter the milk, doesn't affect baby. Wait until your OB-GYN clears you for postpartum activity (typically 6 weeks post-vaginal delivery, longer post-C-section). After clearance, many postpartum users find it helpful for cramps that returned after their cycle came back.

How long does the battery actually last?

5 hours and 7 minutes on heat-only mode (independently tested at 38°C ambient). Heat plus vibration: about 3.5 hours. Most users get a full Day One with one charge. USB-C charges to full in roughly 2 hours from any phone charger.

What size do I need?

Adjustable strap fits 24–46 inch waists with no add-ons. If you're outside that range, email us before ordering — we'll tell you straight if it'll fit. We've shipped to women across the full size range and it's never been a problem within those numbers.

Can I use it while pregnant?

No. Heat applied directly to the abdomen during pregnancy is not recommended. Talk to your OB. We're not the right tool here. Save it for after your cycle returns.

How does the 60-Day Relief Promise actually work?

Email us within 60 days of receiving the belt. One email. No forms, no photos, no "please give it one more month." We process the refund within 48 hours. You don't ship the belt back. Keep it, donate it, gift it. We mean it. Watch the 60-second walkthrough on this page.

Why is this different from the popular TENS device whose company stopped responding?

Two things. One: heat works through a different mechanism than TENS. TENS blocks the pain signal at the nerve. Heat reopens the constricted blood vessels feeding the muscle. If TENS didn't work for you, that doesn't mean nothing will. Two: our refund SOP is documented, time-bound (48 hours), and demonstrated on video. We learned from what didn't work in this category and built the opposite.

Your pain is real.
The biology is real.
Now there's a wearable built for the way it works.

Free UK shipping. 60-Day Relief Promise. Health Cash Plan eligible. No subscription required.

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