i
The Day One bathroom floor.
Awake at 4am, knees pulled in, sweating through the sheets. The heating pad you fell asleep with is cold. The ibuprofen was three hours ago.
I just lie there waiting for the morning so I can pretend to function.
Drug-free · Peer-reviewed wearable
Take Day One back.
Continuous heat at 38–45°C plus calibrated vibration. Two physiological angles attacking the Prostaglandin Lockdown at once. Built for the way cramps actually work.
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60-day refund
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Mood: belt on linen sheets, natural window light, warm cream tones
Why this exists
You've been told it's normal. It's just badly understood.
One in three British women lose meaningful function to period cramps each cycle. Not because they're soft. Because the biology is nastier than the diagrams in school suggested, and most household solutions only address half of it.
The four moments we hear most.Pulled from 109 conversations with women who'd already tried four other things before finding peryode.
ii
The cancelled brunch.
You said yes on Wednesday. By Friday morning the cramps tell you Saturday isn't happening. Another text apologising. Another friend who half-believes you.
Eventually they stop inviting me on Day One weeks. I don't blame them.
iii
The meeting you sat through.
You showed up because the project mattered. Nodded at the right beats, smiled when expected. Spent the whole hour trying to slow your breathing so nobody would notice.
Half the things I've ever agreed to at work, I agreed to because the cramps wouldn't let me think.
iv
The shirt you can't fully button.
The waistband presses where it shouldn't. The blazer feels like a cage. You've already changed twice. You'll change again before the door.
Some weeks I'd give anything just to wear the clothes I actually own.
These aren't dramatic stories. They're the boring, repetitive cost of cramps the category never quite solved. The reason they keep happening is mechanical, not personal.
Cramps aren't one problem. They're three.
Primary dysmenorrhea is a chemical, vascular, and neurological event happening at the same instant. The household solutions you've tried each address one of them. The Prostaglandin Lockdown survives by attacking all three at once.
i
The chemical
A prostaglandin overload signals the muscle to contract harder.
Roughly one in three women produce prostaglandin F2-alpha at concentrations that force uterine hypercontraction. Ibuprofen blocks production at the source. Heating pads do nothing for this layer.
ii
The vascular
The same chemical constricts the vessels feeding oxygen to the muscle.
The muscle is asked to work overtime while being starved of oxygen. Mayo Clinic compares the pain mechanism to cardiac angina. Continuous heat at 38–45°C reopens the vessels.
iii
The neurological
The pain signal travels uninterrupted to the spinal cord.
Slow C-fibres carry the cramping signal up. Calibrated vibration on faster A-beta fibres closes the gate at the spine before it reaches the brain. Gate-control theory, peer-reviewed since 1965.
Why most solutions only get you partway
Heating pads fight one. Ibuprofen fights another. Almost nothing fights all three.
Most British homes have a tool for one or two of these failure points. The wearable that addresses all three on the same belt is the gap peryode was built to fill.
Sources: Scientific Reports, Nature, 2018 (n=274) · Melzack & Wall, Science, 1965 · Mayo Clinic Cardiovascular Research, 2019
DualWave Relief BeltReplace with product photo
The wearable
DualWave Relief Belt by peryode.
The first wearable that addresses the vascular and the neurological layers of primary dysmenorrhea on the same device. PTC ceramic heat plus calibrated vibration. Drug-free. Built to be kept for the next decade of cycles.
38–45°CPeer-reviewed range
91 secondsCold start to therapeutic
5h 07m runtimeA full Day One
4mm profileDiscreet under any layer
Starts atfrom£59.99
Choose your kit
Free UK shipping on £69+
60-day refund
No subscription
Heat at 38–45°C continuous
matched ibuprofen for primary dysmenorrhea.
A 2018 meta-analysis published in Nature Scientific Reports reviewed three randomised controlled trials. Combined sample: 274 women. The finding wasn't "comparable." It was equivalent.
38–45°C
Therapeutic range
peer-reviewed for primary dysmenorrhea
n=274
Combined sample
across three randomised controlled trials
91s
To therapeutic temperature
from cold start, independently tested
5h07m
Single-charge runtime
continuous heat at 38°C, lab measured
Source: Jo, J., & Lee, S. H. (2018). Heat therapy for primary dysmenorrhea: a systematic review and meta-analysis. Scientific Reports, 8, 16252. Nature Publishing Group.
The finding, in plain English
Continuous calibrated heat performed as well as 400mg ibuprofen every six hours for primary dysmenorrhea, measured by VAS pain scores at hours four, eight, and twenty-four post-onset.
A note from the founder
I built peryode because nothing on the shelf actually worked for me.
I'd had cramps since I was 17. By 32 I'd tried the heating pad my mum kept in the airing cupboard, the ThermaCare patches that lasted thirty minutes, the viral TENS device whose battery died in week six while the brand quietly stopped responding to my emails. I was taking 800mg of ibuprofen across each Day One, which my GP told me, eventually, was concerning.
A friend who works in obstetric research handed me a 2018 Nature paper. I read it three times. Period cramps aren't just muscle contractions. Prostaglandin F2-alpha forces the uterus to hypercontract while simultaneously starving it of oxygen. Nothing I owned addressed both at once.
So I worked with engineers and obstetric researchers to spec the wearable I wished I'd had at 22. PTC ceramic heat at 38–45°C, the temperature peer-reviewed to match ibuprofen efficacy. Calibrated vibration that closes the gate on the pain signal at the spinal cord. Two mechanisms, one belt, built once and 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 and you keep the belt. We mean it because the women who came before you were owed it.
Margot Ellis
Founder · peryode
Sixty days. One email. We mean it.
Test the belt for two full cycles. If it doesn't earn its place in your life, the next steps belong to you. No fine print, no return shipping, no follow-up calls.
i
One email
No forms. No questionnaires.
Reply to your order confirmation or write to care@peryode.com. Subject line: "Refund." That's the entire request.
ii
48 business hours
Refund processed within two days.
Money lands back to your original payment method within 3–5 working days, depending on your bank. Most refunds clear within 24 hours of request.
iii
Keep the belt
No return shipping required.
We don't pay you to put a used medical-grade device through Royal Mail return logistics. Donate it, gift it, recycle it. The belt was built to be kept.
The femcare category trained women to expect the opposite. We documented our refund SOP in writing because we'd rather lose money than have you think this is another wearable that might quietly stop working.
Read the full promiseBuilt for the way cramps actually work
Your next Day One doesn't have to be the worst day of your month.
Two physiological angles. One belt. Sixty days to find out if it changes your cycle. The risk on this purchase is ours, not yours.
Free UK shipping on £69+
60-day refund · One email
No subscription
peryode · est. MMXXIV · Manchester, UK