Men's innerwear, loungewear and thermals

Buy men's innerwear online from PUMA, FCUK and French Connection

Underlinen is an authorised multi-brand online store for men's innerwear, loungewear, thermals and socks, delivered across India. Instead of hopping between brand sites, you can compare PUMA, FCUK and French Connection side by side, in one cart, with size charts on the product pages and fast delivery. Everything here is 100% genuine and sourced directly from the brands.

The range is built around what men wear every day: trunks, briefs, boxers and vests under your clothes, T-shirts and lounge pants for home, thermals and sweatshirts for the cold months, and socks in every length.

• Innerwear, loungewear, thermals and socks from three brands in one store
• Size charts on the product pages, so you can check before you order
• Orders processed within one business day and delivered across India

Men's trunks, briefs and boxers

Trunks for a close fit with more coverage

Trunks sit like briefs at the waist but carry a short leg, so they stay in place under fitted trousers and do not ride up when you sit or walk. Choose cotton trunks for everyday wear, printed trunks when you want some colour in the drawer and bamboo trunks for a soft feel on warm days. Shop all trunks for men, or go straight to PUMA trunks and FCUK trunks.

Briefs for a classic, secure fit

Briefs are the classic cut: a mid or low rise, no leg and nothing extra under slim trousers. Cotton briefs cover everyday wear and printed briefs add a bit of personality. Compare PUMA briefs and FCUK briefs, or see every brief for men in one place.

Boxers for room to move

Boxers are loose through the leg and made for comfort at home, in bed and on warm evenings. PUMA boxers come in woven prints and solid colours, and the full range sits under boxers for men.

What to wear under what

Picking innerwear is easier when you start from what you are wearing over it. Here is how the range fits a normal week, from office days to slow Sundays at home.

• Under a formal shirt: a white or light vest keeps the shirt smooth and stops it clinging on a warm day.
• Under slim trousers or jeans: trunks or briefs, which sit flat and do not bunch at the leg.
• Under light casual shirts: a soft vest with trunks or briefs.
• At home and stepping out: boxers or lounge shorts with a lounge T-shirt, or lounge pants for your one-mile runs.
• For cold mornings and winter travel: a thermal top and bottom under your clothes, with a sweatshirt on top.
• In warm, humid weeks: cotton and bamboo styles in lighter colours.

Vests for men that stay smooth under a shirt

A good vest is the layer nobody sees. It sits flat under a formal shirt, takes the heat of the day and keeps your shirt looking fresh for longer. White vests are the classic under office and casual shirts, while coloured and sleeveless styles double up as easy lounge tops.

Browse vests for men, white vests, cotton vests, PUMA vests and FCUK vests. Every size S vest in the store is on offer.

Thermals for men and women

A thermal is a warm layer that sits close to your skin under a shirt, jacket or sweater. It holds warmth in without adding bulk, which is why it works for cold mornings, winter travel and trips to the hills.

A thermal should fit close without pinching. If you can gather a lot of loose fabric at the waist or chest, go a size down, and if the seams pull, go a size up. Wear it as the first layer, with your shirt or casual top over it and a jacket on top.

Start with a matched top and bottom: thermal tops for men and thermal bottoms for men, or the full PUMA thermals range. For women, Underlinen stocks PUMA thermal tops and pants in the same close, warm fit.

Loungewear, T-shirts and sweatshirts

Lounge pants and shorts

Loungewear is built for life at home and everything within a mile. Lounge pants and lounge shorts should feel soft from the first wear, with a waistband you stop noticing and room to relax, move, or step out for coffee. See PUMA lounge pants and joggers, FCUK lounge pants and joggers, FCUK loungewear and French Connection loungewear.

T-shirts and lounge tees

From solid crew necks to graphic prints, the T-shirts for men range covers tees you can wear out and lounge T-shirts made for easy comfort at home and casual step-outs. Shop by brand with PUMA T-shirts and FCUK lounge T-shirts, or pick a tank top for warm days.

Sweatshirts and hoodies

For cool mornings and evenings, sweatshirts for men include crew necks, high necks and zip-up hoods from French Connection. Wear one over a tee now and over a thermal when it gets properly cold.

Socks for every shoe

The right sock is the one you never think about. Match the length to the shoe: no-show socks for loafers and slip-ons, low-show socks for sneakers, ankle socks for everyday shoes and crew socks for boots and formal shoes. Cushioned socks add a softer footbed for long days on your feet.

Shop PUMA socks, including PUMA ankle socks, PUMA crew socks and PUMA no-show socks, or FCUK and French Connection socks.

Fabrics you will find here

Most of the range is cotton, the everyday choice for innerwear because it is soft and easy to wash. Some styles add a little stretch to the cotton for a closer fit, PUMA's bamboo trunks use a bamboo blend that feels soft and cool, and a few FCUK styles use a light mesh knit.

Thermals are made to sit close to the skin and hold warmth in, while the sweatshirts and lounge pants are soft knits made for home and cool evenings. Product pages carry the brand's own notes, including fabric and care where the brand gives them, so you can check before you order.

Value packs and combos

Many styles come in packs of 2 or 3, which brings the price per piece down and keeps your drawer stocked in one order. See every value pack and innerwear combo in one place, and check the Offers page for styles with a price drop right now.

A pack is also the easy way to try a new brand or cut. Pick a pack of 2 in your usual size, wear it through a week of washes and then restock the style that works for you. The product page shows the price of the whole pack and roughly what each piece works out to.

Shop by brand

Underlinen stocks three brands, each with its own look. Here is what you will find from each of them.

PUMA

PUMA at Underlinen covers innerwear, vests, T-shirts, lounge pants, thermals and socks, including bamboo styles. Shop PUMA for men.

FCUK

FCUK brings bold waistbands and prints across trunks, briefs, vests, lounge tees and lounge pants. Shop FCUK for men, or start with FCUK underwear.

French Connection

French Connection covers sweatshirts, loungewear, trunks and socks with a clean, understated look. Shop French Connection for men.

Buying innerwear online: what to check

Buying innerwear online is simple when you know where to look. On the product page, check these before you add to cart:

• The size chart, measured against your own waist or chest
• The pack size, since many styles come in packs of 2 or 3
• The colour combination, shown in the swatches and photos
• The fabric and care notes from the brand

The price on the product page follows the colour and size you pick, so what you see is the price of that exact piece. Size S vests show their offer price as soon as you select size S.

How to choose the right size

Go by your measurements, not the size on your last pair. Sizing differs between brands, and innerwear is worn close to the skin, so a quick check saves a second order.

Use the size chart on the product page. Measure your waist at the navel for innerwear and loungewear, and your chest for vests, T-shirts and thermal tops. If you are between sizes, or a style has no chart yet, write to wecare@underlinen.com or call +91-9900998287 and the team will help you pick.

Making innerwear last

Most innerwear does not wear out. It gets washed out. Wash cold, keep fabric softener away from elastic waistbands, dry in shade and skip the hot iron. Rotate a few pairs rather than wearing the same two, and replace anything that has lost its shape at the waist.

Wash dark and printed pieces inside out, and apart from whites for the first few washes. Hang thermals and lounge pants to dry instead of wringing them, and fold knitwear rather than hanging it so it keeps its length. When the care label says something different, follow the label.

Why shop at Underlinen

• 100% genuine: an authorised multi-brand store, sourced directly from PUMA, FCUK and French Connection
• Three brands, one cart: compare styles, fabrics and prices side by side
• Size help: size charts on the product pages and a team that answers by email and phone
• Delivery across India: orders are processed within one business day and usually arrive in 2 to 7 business days
• Value packs: many styles come in packs of 2 or 3, so the price per piece drops