To mark the 25th anniversary of 100% Design, Dezeen is partnering with Daa to offer readers the chance to win one of its Rock chairs designed by Marc Sadler.

This competition has now closed. Congratulations to the winner, who is Samantha McGeorge from London, UK.

Italian brand Daa will be presenting furniture from its collection at 100% Design – a design show for industry professionals and enthusiasts that takes place at Olympia, London, from 18 to 21 September.

This will be the first time that the brand based in Lecce, southern Italy, will take part in a fair in the UK.

Dezeen has teamed up with the furniture company to give away a red Rock chair designed by Marc Sadler for Daa, that comes without the optional armrests or seat cushion.

The Rock chair is three-legged with a wide seat, and is designed to be stacked one on top of the other, for ease of storage.

Made entirely from aluminium, the frame of the chair consists of round tubes supporting an ergonomic backrest. A singular back leg consists of a concave shaft, that attaches at the back of the seat.

"The three-legged chair is an anti-conformist, contrary to conventions and common sense," said Sadler. "With its distinctive mark – the T-shaped back leg – the Rock chair pays homage to the fork of the legendary Harley Davidson."

Sadler explained to Dezeen that as well as the motorbike, the chair references industrial structures such as the Eiffel Tower or the fuselage of an old airplane model. It is intended to be "an object that gets noticed".

The designer also cites the work of French designer and metal-worker Jean Prouvé as an influence on the Rock chair.

The lightweight chair is easy to move from indoors to outdoors, and has a seat that is secured by visible rivets punched into the frame.

The brand intentionally left the frame's joinery revealed, to demonstrate the metalworking processes and techniques that characterise Daa's products.

"With Daa, we wanted to create something that would reflect the remarkable industrial know-how of the company," said Sadler, who was born in Austria but lives and works in Milan.

Designers at Daa – which means "to" and "from" in Italian – are trained in working with heavy machinery and adapt these skills to the "new challenge" of manufacturing home furniture.

The collaborative process of metal craftsmanship including welding, bending and finishing the products, helps maintain an "appreciation for traditional workmanship" whilst seeking new technological solutions.

"The post-industrial image of the Rock chair comes from its complex construction and the combination of many metalworking techniques," explained the brand.

This year 100% Design celebrates its 25th anniversary with an array of world-renowned brands, interactive experiences and a four-day talks programme.

Daa will join a host of other furniture brands, including Benchmark, Dare Studio, Haberdashery, Another Country, and Swedish furniture-makers Gärsnäs and Bsweden in taking part.

As well as product launches, the fair will include a sustainable log-house, an Underground carriage from 1967 and a showcase of tactile materials.

Daa is offering one Rock chair in the red colourway to a Dezeen reader. Two-toned variations of the chair that highlight its different components are available to buy but are not included in the competition.

To find out more about 100% Design or to register for a ticket, visit its website.

Competition closes 25 September. The prize includes a monochromatic chair with red frame, seat and backrest. One winner will be selected at random and notified by email, and his or her names will be published at the top of this page.