Half a million pairs of Zaggora’s HotPants were sold in 16 months across 110 countries as women everywhere hoping they could heat themselves thinner.

And now, Zaggora, the firm behind the heating shorts is back – and this time they are after your bingo wings.

The new upper body range – blazers, bras and tops – joins the HotPants and leggings as part of the hi-tech collection of products that the manufacturers claim can assist wearers to burn 18% more calories across a workout than if you wore regular workout gear.

Zaggora say that their products work by increasing perspiration, with results “lab-proven” by scientists after researchers from the Chelsea School of Sport at Brighton University reported weight loss to be four times greater in subjects who exercised wearing the HotPants.

The core temperature in wearers of HotPants – said to include celebrities like Denise Richards, Tess Daly, Kristin Cavallari and Natalia Vodianova along with the regular folk – increased by an average of 18 per cent compared to the control, with effects ongoing after activity ceased, they claim.

Zaggora HotPants work by increasing perspiration

The new upper body range – which includes the Body Blazer, hooded Body Blazer, Coola bra and Hot Top to target arms, back and tummy – uses the same Celu-Lite fabric technology as the HotPants.

Zaggora say it is designed to “harness the body’s natural heat” during activity in order to help increase core temperature and calorie burn.

“Each product has been developed to offer time-pressed women smart solutions to getting active, from ramping up energy expenditure to get the most from their time at the gym to incorporating fast-wicking, odor absorbing fabrics,” they said.

Zaggora founder Dessi Bell said: “We wanted to develop new products that our customers really wanted. Nothing is more powerful than putting customers in the driving seat.

“So, that is exactly what we have done and we are so proud of the results. Happy calorie burning!”