Why buy Impetus men's underwear? Because Thinking Man's underpants come from Portugal. Every design in the Impetus collection has something extra within its design.

Some are antibacterial, anti-odour, cooling, warming, temperature balancing, fast dry, sustainable – and one line is helping re-use plastic debris from the ocean. These male boxer briefs, briefs, maxi trunks and longer leg shorts provide a gent with a more comfortable personal environment every moment of his day, whether he's relaxing, in an important meeting, running, climbing a steep hill or flying across time zones. There are even undies using yarn originally created for space travel.

Impetus men's underwear made a welcome return to DGU in 2019, largely because nobody had ever forgotten the brand's famous Cotton Seamless briefs and boxers. Others have followed with totally seam free male underwear, but the original Impetus ultra smooth underpants, now back on sale at Deadgoodundies in black, white, grey or blue, has never been matched. As the name suggests, there are no seams, no internal labels, just a cleverly created masculine hug.

Since the Portuguese designer collection's first incarnation on our website it has continued to develop more carefully thought-out male underwear, each line with a clear purpose in mind, without shouting about it.

Impetus has thermals for cold weather, underwear for active men, compression shorts for sport or long journeys, and of course exquisite quality cotton briefs and boxers for men who like a bit of luxury without a premium price tag.

Impetus Sport features a longer leg Long Boxer, maxi trunk Sport Boxer and midi Sport Brief shapes in classic black, bright blue or bright red. Breathable and wicking, this male underwear is also antibacterial.

Impetus Innovation underwear for men uses a fabric with Outlast micro capsules developed by NASA in a boxer or brief. In black or white, this mini slip and men's short provide ultimate temperature balance as well as moisture management.

Or you could go a step further and wear a Renergize Long Boxer – compression shorts with an extra long leg that smooth while reducing the risk of blood clots and injury during exercise.

For long days sitting or travelling Impetus Travel Premium is the answer in a totally smooth boxer or brief made from breathable Lyocell. This Tencel yarn, made from trees, keeps skin dry and a chap's genitals super comfortable. The alternative is the über fine Impetus Voyager Boxer Brief with the longer midcut leg. Antibacterial, anti-odour and wonderfully soft, this men's underwear short has special credentials – the yarn is made from plastics recycled from the ocean, and the resulting fabric takes 40% less time to dry that an equivalent male trunk in cotton. Very handy for travels or men with a tight timetable.

And for every day there's a good choice in Impetus Cotton Stretch undies which come in various guises, some with a deep fashion waistband, others with low key branding, in single pairs, double and triple packs of briefs and boxers. As the name suggests these are classic stretch cotton underpants for men, but because they're made in Portugal, these are far from basic pants.

Why would a man choose Impetus men's underwear for himself? Most definitely the quality, but also the brand's dedication to solving male problems when it comes to getting too sweaty, sticky or snug. Finding the right male solution on requires careful reading of each brief or boxer's talents on our bespoke product description, which highlights essential design details, fabric content and measurements – more than just the size guide.

To add to the core Impetus offer, has added a capsule collection of spring fashion ranges in great colours and prints, in silky microfibre, cotton and modal, including male maxi boxer shorts, mini briefs and chic tanga thongs for men. Look out for painted, floral and graphic prints alongside on trend solid colours like Chinese red and blue, all with the neat signature waistband which hints at the brand name with one capital letter - I for Impetus.

They really do think of everything.

Designed for action - and comfort – Impetus sports underwear for men comes in two varieties, one (pictured) is the temperature regulating Impetus Sport Boxer 2051B87 in bright blue or black in this maxi short shape at £18.50 or a Long Boxer at £21.00. The other designs are available in black or ladybird red in fabulous AirFlow fabric that provides superb support and breathability.

Impetus Cotton Stretch men's underwear also provides different looks based on the same theme – brilliant comfort, shape and great washability. This low key Impetus Cotton Stretch 2 Pack Boxer (£27.00 for two pairs the same colour) can be put through a hot wash at 60 degrees. With cotton briefs and boxers from Impetus, you can decide whether you want to show off your favourite men's underwear choice on the waistband or keep it to yourself with subtle branding.

Impetus go for the same attention to detail and maximum comfort in their fashion ranges too. The Impetus H52 Hyper Trunk (£22.00) is a low rise boxer brief short in silky microfibre in a pattern of spotty and plain wavy stripes. This close fitting, tagless male trunk has a two-tone waistband finished with the capital I brand signature.