Pregnancy changes your body in ways that can make everyday underwear suddenly feel uncomfortable. Waistbands begin to dig in, thighs may rub more than usual and fabrics that once felt fine can become irritating against sensitive skin.
Flissie women’s bamboo boxer shorts are designed with comfort at their core, making them a soft, breathable and practical choice throughout pregnancy and into postpartum recovery.
Quick answer: in pregnancy, look for boxer shorts with a wide, soft waistband that can sit beneath your bump and a leg long enough to put a smooth layer between your thighs, such as a 6 inch leg, and Flissie women's bamboo boxer shorts (we make them) have both. Start with the 6 inch leg, which covers the thighs and comes in all 8 colours, in every size from UK 8 to 30 at the same price. If you are between sizes or want room for your bump, size up: the size swap on your whole first order is free, and the 60 day guarantee covers a full refund, worn or not.
Try Flissie women's bamboo boxer shorts
£20 a pair, or £13 a pair in a 7 pack, in UK 8 to 30 at one price. Free UK delivery on every order, a free size swap on your whole first order, and a 60 day guarantee: full refund, worn or not.
Soft, breathable bamboo viscose
Hormonal changes and increased blood flow can leave you feeling warmer during pregnancy. Flissie boxer shorts are made from 95% Tanboocel bamboo viscose and 5% elastane, creating a beautifully soft and breathable fabric that allows air to circulate.
The lightweight material helps move moisture away from the skin, helping you feel fresher and more comfortable throughout the day. It feels soft from the first wear, without the stiffness of fabrics that need time to be broken in.
You can learn more about the fabric and how it is produced on our Sustainability page.
A wide waistband that feels supportive, not restrictive
As your bump grows, tight or narrow waistbands can quickly become uncomfortable. Flissie boxer shorts feature a wide, soft waistband designed to sit smoothly against your body without digging in.
The flexible fabric moves with your changing shape, while the waistband can be positioned beneath your bump if that feels more comfortable as your pregnancy progresses.
Every pregnancy body is different, so we recommend checking our Flissie size guide and sizing up if you are between sizes or would prefer some additional room.
Longer legs against thigh chafing
Changes to your body, water retention and the way you walk during pregnancy can make thigh rubbing more noticeable. Flissie boxer shorts are available with a choice of 6-inch or 9-inch legs, providing a smooth layer of fabric between your thighs to help reduce skin-on-skin friction.
Their longer length makes them particularly comfortable beneath dresses and skirts, especially during warmer weather when chafing can become more uncomfortable.
Start with the 6-inch length, the best seller, which covers the thighs and comes in every colour and size; the 9-inch style, in black and pine green, sits just above the knee if you prefer a longer leg. You can compare both options when you shop Flissie boxer shorts.
Smooth comfort for more sensitive days
Your skin may feel more sensitive during pregnancy, making seams, labels and tight clothing much more noticeable. Flissie boxer shorts are designed to feel smooth and gentle against the body, with soft fabric and a comfortable fit that helps minimise rubbing and irritation.
They can be worn beneath everyday clothes, maternity wear, dresses or simply on their own while relaxing at home.
Comfortable during pregnancy and after birth
Flissie boxer shorts aren’t only useful while your bump is growing. Their soft, flexible fit can also make them a comfortable underwear option after giving birth, when your body may still feel tender and restrictive clothing is the last thing you want.
They provide gentle coverage without tight shaping or compression, making them an option you can continue wearing long after pregnancy.
If you have had a Caesarean birth, always follow the advice of your midwife or healthcare professional about clothing and underwear worn near your incision.
Real experiences from pregnant Flissie customers
Pregnant customers have already shared how Flissie boxer shorts have helped them feel more comfortable as their bodies have changed.
One customer chose a larger size to accommodate her pregnancy bump and described the 9-inch boxers as silky-soft, breathable and comfortable enough to wear throughout pregnancy and postpartum. Another said she wanted underwear that felt comfortable while still looking nice and found that Flissie gave her exactly that.
You can find more verified customer experiences on our Flissie reviews page.
Choosing the right size during pregnancy
Flissie boxer shorts are available in UK sizes 8 to 30. During pregnancy, comfort should always come before sticking to your usual size.
Consider sizing up if:
- You are between two sizes
- Your current underwear feels restrictive
- You would like more room for your changing body
- You prefer a more relaxed fit around your bump
- You want to continue wearing them later into your pregnancy
The size swap on your whole first order is free, giving you the reassurance of finding the fit that feels right for you.
Caring for your bamboo underwear
Looking after your Flissie boxer shorts correctly will help preserve their softness, shape and breathability.
Wash them at 30°C or below, avoid fabric softener and allow them to air-dry wherever possible. For more advice, read our complete guide on how to wash bamboo underwear.
Pregnancy underwear that still feels like you
Pregnancy underwear doesn’t have to feel clinical or temporary. Flissie boxer shorts are available in a range of colours, including two nude shades, and are designed for real bodies at every stage of life.
Soft, breathable and made with a longer leg, they offer everyday comfort as your body changes, from the early weeks of pregnancy to postpartum recovery and beyond.
Pregnancy underwear FAQs
Are Flissie boxer shorts suitable during pregnancy?
Yes. Flissie women's bamboo boxer shorts (we make them) can be a comfortable choice during pregnancy because they are made from soft, breathable bamboo viscose and have a flexible fit, wide waistband and longer legs.
Should I size up during pregnancy?
You may prefer to size up as your body changes, particularly if you are between sizes or want more room around your bump. Check the Flissie size guide before ordering.
Which leg length should I choose?
For Flissie women's bamboo boxer shorts (we make them), start with the 6-inch, the best seller: it covers the thighs, comes in all 8 colours and every size from UK 8 to 30, and works well beneath shorter dresses and skirts. The 9-inch style, in black and pine green, reaches just above the knee if you prefer a longer leg.
Can I wear Flissie boxer shorts after giving birth?
Their soft fabric and non-restrictive fit can make them comfortable during postpartum recovery. If you have had a Caesarean birth or experienced complications, ask your healthcare professional what type of underwear is appropriate for you. Our C-section knickers guide goes through what to wear after a caesarean, week by week.
How should I wash bamboo boxer shorts?
Wash at 30°C or below, avoid fabric softener and air-dry to help preserve the fabric’s softness and breathability. Read our bamboo underwear care guide for full instructions.
What is the best underwear for pregnancy?
Underwear with a wide, soft waistband that does not dig in, a soft, breathable fabric and room to size up as your shape changes. Our pick is Flissie women's bamboo boxer shorts (we make them): 95% Tanboocel bamboo viscose, a wide waistband that can sit beneath your bump and a 6 inch leg, in UK 8 to 30.
How do I stop my thighs rubbing when pregnant?
Put a smooth layer of fabric between them so they glide instead of rubbing; a boxer short with a longer leg does this, and it helps most under dresses and in warm weather. The 6 inch Flissie women's bamboo boxer shorts (we make them) cover the thighs and come in all 8 colours; the 9 inch, in black and pine green, sits just above the knee if you prefer a longer leg.
Should maternity underwear go over or under the bump?
Wherever feels more comfortable, as long as the waistband does not dig in. The wide, soft waistband on Flissie women's bamboo boxer shorts (we make them) can sit beneath your bump, and the flexible fabric moves with your changing shape; size up if you want more room around your bump.
Discover softer, more breathable comfort throughout pregnancy. Shop Flissie women’s bamboo boxer shorts →
