Brand page · Clothing · United Kingdom
Underdays: 79.2K visits a month, 349 active Meta ads, Gravity score 589.
Underdays — Underdays is a brand that sells breathable and comfortable everyday TENCEL™ underwear for women, focusing on ethical basics that prioritize women's health and comfort. In September 2026 theunderdays.com drew an estimated 79.2K visits, up 8% on the month before. It ranks #654 of 19,668 Clothing brands in United Kingdom and holds a 4.5 Trustpilot rating over 196 reviews.
Updated Traffic Sept 2026Meta ads 13 Oct 2026Google ads 20 Oct 2026Trustpilot Oct 2026Catalogue Oct 2026Gravity score 2 Nov 2026
Gravity score
Percentiles within 1008 peers: Clothing brands in United Kingdom with 30K–100K monthly visits. Recomputed nightly, last on 2 Nov 2026.
About the store
Underdays is a brand that sells breathable and comfortable everyday TENCEL™ underwear for women, focusing on ethical basics that prioritize women's health and comfort.
01 · Traffic
How much traffic Underdays gets.
The traffic card of the Gravity brand page: the latest month and its two trends. The monthly curve, 24 months of history, the audience by country, the traffic sources and the category comparison are for members, free to start.
Underdays drew an estimated 79.2K visits in September 2026, up 8% on the month before and down 11% over three months.
- Worldwide#114,611of 4.5M sites · Top 5%
- In United Kingdom#5,975of 192K sites · Top 5%
- Clothing, worldwide#11,022of 459,295 brands · Top 5%
- Clothing, United Kingdom#654of 19,668 brands · Top 5%
79.2K
estimated visits in September
1 mo ▲ +7.6%4 mo ▼ −11.1%
The monthly curve, 24 months of history and the category comparison.
Create your free account02 · Reviews
What customers say about Underdays.
The review cards of the Gravity brand page: the Trustpilot page, with its star distribution and the brand's tiers against the index, and the Google reviews. The TrustScore history and the review velocity against the category are for signed-in members.
Underdays holds 4.5 out of 5 on Trustpilot over 196 reviews, 168 of them in the last twelve months: 73% of customers give five stars and 10% one star. That volume places Underdays in the top 20 % of the 270,321 Trustpilot pages in the Gravity index, and its rating quality in the top 30 %.
Underwear Store
Data not available
Review velocity, TrustScore history and the category comparison are on the Gravity brand page.
03 · Products
What Underdays sells, ranked by sales.
The top three products in the catalogue, in the store's own best-seller order, with price and stock. The full catalogue, the rankings over time and the ads that lead to each product are for signed-in members.
Underdays sells on Shopify, 90% of its catalogue in stock. The best seller is The Everyday Thong - Black, at £18.00, followed by The Workout Thong - Black and The Everyday Brief - Black.
#1The Everyday Thong - BlackUnderdays£18.00In stock
#2The Workout Thong - BlackUnderdays£18.00In stock
#3The Everyday Brief - BlackUnderdays£20.00In stock- +View all productsRankings over time, ratings, stock and the ads that lead to each product. Free account.Sign in to Gravity
Share of the catalogue by product family.
The dominant category places Underdays in its comparison group.
- Average rating
- 4.65 / 5
- Rated products
- 95% of the catalogue
- In stock
- 90%
- Upper price quartile
- US$59.56
- Currency
- GBP
04 · Ads
What Underdays is advertising right now.
Meta and Google ads, as the Gravity brand page shows them; the blurred ones are placeholders. Every creative, how long it ran, its EU reach and the estimated monthly spend band are for signed-in members.
Underdays runs Meta ads on Facebook, Instagram, Messenger, Audience Network, Threads, and has advertised on Google since May 2023 (image, text, video).
3 FOR 15% OFFUnderdays12 Oct 2026video
Claim your FREE PouchUnderdays12 Oct 2026video
Claim your FREE PouchUnderdays12 Oct 2026image- +View all Meta adsReach per ad, how long each creative ran, and the estimated monthly spend band. Free account.Sign in to Gravity
Text ad20 Oct 2026Untold Underwear LTDverified
Text ad20 Oct 2026Untold Underwear LTDverified
Text ad19 Oct 2026Untold Underwear LTDverified
- +View all Google adsFormats, first and last seen, and the keywords the brand bids on. Free account.Sign in to Gravity
05 · Influencers
Who talks about Underdays.
The creators who tag @theunderdays on Instagram, found by Gravity by Benchr in their posts. One is shown here; the full list, the audiences and the contact details are for signed-in members.
Creators tag @theunderdays on Instagram, led by LIULLLAND👵🏼Style (193K followers, 1.9% engagement).
| Account | Profile | Followers | Engagement | Tags | Relationship |
|---|---|---|---|---|---|
| LLIULLLAND👵🏼Style@_liullland · 🇩🇰 DK | Fashion style luxury Creator | 193K | 1.9% | 2 | Tagged @theunderdays |
06 · Competitors according to Gravity
Who Underdays competes with, by the numbers.
Gravity picks competitors from the index itself: same category, same market, similar size. The closest are named here; their figures, the full list and the side-by-side comparison are for subscribers.
Gravity by Benchr finds competitors for Underdays among Clothing brands in United Kingdom. The closest is Underdays, then Playful Promises, Bluebella, The Big Bloomers Company, Lemonade Dolls, Molke.
| Brand | Similarity | Gravity score | Est. traffic | Trustpilot | Meta ads | Products | |
|---|---|---|---|---|---|---|---|
| Underdaysus.theunderdays.com | |||||||
| Playful Promisesaus.playfulpromises.com | |||||||
| Bluebellabluebella.com.au | |||||||
| The Big Bloomers Companythebigbloomerscompany.co.uk | |||||||
| Lemonade Dollslemonadedolls.com | |||||||
| Molkemolke.co.uk |
07 · Company
The company behind Underdays.
Legal entity, funding and distribution, as the Company tab of the Gravity brand page shows them. Where Gravity has nothing on file, the line says so rather than disappearing.
Underdays is a company based in London, United Kingdom, founded in 2021 according to LinkedIn, on a domain registered in November 2020. It employs about 10 people.
- Legal name
- Data not available
- Registration no.
- Data not available
- VAT
- Data not available
- Legal form
- Data not available
- Entity country
- 🇬🇧 United Kingdom · London
- Founded
- 2021, per LinkedIn
- Domain registered
- 27 Nov 2020
- Share capital
- Data not available
- Status
- Operating
- President
- Data not available
- Activity code
- Data not available
- Employees
- 10 on LinkedIn
- Funding stage
- Data not available
- Total raised
- Data not available
- Investors
- Data not available
- VC-backed
- Data not available
- Own store
- theunderdays.com · Shopify · GBP
- Catalogue
- 66 collections
- Retailers
- None recorded
- Open jobs
- None recorded
08 · What people ask about Underdays
What people ask Google about Underdays.
11 answers built from the data on this page, each one sourced to Gravity by Benchr, which say so when we don't know.
Is Underdays a legit company?
According to Gravity by Benchr, Underdays is a brand based in London, United Kingdom: its website has existed since November 2020, its Trustpilot profile is claimed by the brand, it sells on a Shopify store, it employs 10 people on LinkedIn, it has 180,933 Instagram followers. Those are the marks of an established brand, not a pop-up shop. Source: Gravity by Benchr brand index, November 2026.
Underdays reviews
Customers rate Underdays 4.5 out of 5 on Trustpilot over 196 reviews, 168 of them in the last twelve months: 73% give five stars, 10% one star. Gravity by Benchr places that review volume in the top 20 % of the 270,321 Trustpilot pages in its index. Source: Gravity by Benchr Trustpilot reading, October 2026.
What does Underdays sell?
Underdays is a brand that sells breathable and comfortable everyday TENCEL™ underwear for women, focusing on ethical basics that prioritize women's health and comfort. Gravity by Benchr classifies it under Clothing, with Lingerie making up 14% of the catalogue. Source: Gravity by Benchr product classification, October 2026.
How much does Underdays cost?
Underdays' best seller, The Everyday Thong - Black, sells £18.00 on theunderdays.com. 90% of the catalogue is in stock. Gravity does not track prices daily: check theunderdays.com before buying. Source: Gravity by Benchr catalogue reading, October 2026.
Does Underdays have a discount code?
Gravity by Benchr does not collect discount codes. What Gravity observes: Underdays advertises on Facebook and Instagram and on Google, where its offers often run. Check theunderdays.com for current promotions. Source: Gravity by Benchr ad records, October 2026.
Where to buy Underdays?
Underdays sells on its own website, theunderdays.com, a Shopify store. Gravity by Benchr lists no retailer or marketplace for the brand. Source: Gravity by Benchr retailer data, November 2026.
Who is behind Underdays?
Gravity by Benchr records a company based in London, United Kingdom, founded in 2021 according to LinkedIn, on a domain registered in 2020, with 10 employees on LinkedIn. Gravity publishes no personal data about founders. Source: Gravity by Benchr company records, November 2026.
Is Underdays doing well?
Not at the moment. Gravity by Benchr estimates about 79,200 visits to theunderdays.com in September 2026, up 8% in a month and down 11% over three months. Underdays ranks #654 of 19,668 Clothing brands in United Kingdom in the Gravity index. Source: Gravity by Benchr estimated traffic, September 2026.
Which platform and tools does Underdays use?
Gravity by Benchr identifies theunderdays.com as a Shopify store (standard plan, not Shopify Plus), selling in GBP. The brand has claimed its Trustpilot profile. It advertises through Meta and on Google since May 2023. Source: Gravity by Benchr platform and advertising records, November 2026.
What is Underdays' ad budget?
Gravity by Benchr does not publish a spend figure for Underdays on this page. What Gravity observes: an active Meta advertiser, on Facebook, Instagram, Messenger, Audience Network, Threads. The estimated monthly spend band, derived from the EU reach of each ad, is on the Gravity brand page. Source: Gravity by Benchr Meta Ad Library records, October 2026.
Who are the biggest Clothing brands in United Kingdom?
Among Clothing brands in United Kingdom in the Gravity by Benchr index, Underdays ranks #654 of 19,668 by estimated traffic. Its closest competitors on the same market are Underdays, Playful Promises, Bluebella, The Big Bloomers Company, Lemonade Dolls. Source: Gravity by Benchr competitor analysis, same category, same market, similar size, November 2026.
Category
Gravity by Benchr indexes more than 4 million e-commerce brands across 150 countries. Figures on this page are estimates, updated monthly; the Gravity score is recomputed nightly. Not affiliated with Underdays.