The Soft Stone back and neck pillows were designed by the Swedish studio for Dream Co. Japan following a two-year research and development process.
Aiming to avoid a clinical look, Claesson Koivisto Rune took inspiration "directly from nature" for the design of the massage pillows, combining a rounded shape with grey speckled fabric to make it look like a stone.
"One of the main challenges of this commission was to encourage the brand to go against the Japanese medical device market sector norms of employing an attention-grabbing mixture of fabrics, colours and forms for the product's design in order to communicate various functions and carve out a market position," the studio told Dezeen.
"In Sweden there are many pebble beaches," they said. "We have always found the rounded stones that you pick up on these beaches both pleasing to the touch and intriguing to the mind."
The pillows are designed to be used on the floor. Their shape ensures users are laid down in the right position, which involves the arching of the chest and neck.
The massage is a similar pressure to a hand massage and is intended to relieve muscle tension caused by stress.
The Stone back and neck pillows will launch during Tokyo Design Week 2016, which takes place from 2 to 7 November 2016.
Claesson Koivisto Rune was founded in Stockholm in 1995 by Mårten Claesson, Eero Koivisto and Ola Rune. The studio started out as an architecture office but has since branched out into all aspects of design, including furniture, lighting, interiors and electronics.