Bed related bed mattress

4 products

Luxurious use of premium natural hair

Craftsman mattresses that go beyond springs.

Each mattress is made to order by masters with a thorough knowledge of the materials and structure, who put their heart and soul into each and every product. Luxurious natural wools such as camel and yak are used to provide a comfortable sleep in all four seasons. Vibration and swaying, which are common with steel wire springs, have been eliminated, and cushioning and ease of turning over have also been pursued. This is a natural, highly functional mattress that Iwata is proud to recommend.

    4 products

    Three features of 'Larkowl'

    1. No steaming

    The urethane and other materials used in conventional mattresses have poor moisture release properties and are prone to steaming, but the natural materials used in Larkowl are excellent at regulating humidity and are resistant to steaming. It realises a good sleeping environment.

    2. No shaking

    Luxury natural hair is stacked so that the fibres become finer in the upper layers. In combination with a polyester core, this also eliminates vibrations and horizontal shaking. The sleeping posture is more stable and it is easier to turn over without feeling a sense of pressure.

    3. Warm

    During the cold winter months, conventional mattresses have the disadvantage that steel wire springs easily transmit cold air. The laminated structure of the "Larkowl" with its metal-free, high-grade natural hair has excellent heat retention properties and is warm in the winter.

    Custom-made mattresses by master craftsmen

    Carefully selected fabrics and materials are used and each item is carefully finished by skilled craftsmen.



    The Good Design Award, organised by the Japan Institute of Design Promotion, is an annual award for things of outstanding design and is the only 'comprehensive design recommendation system' in Japan. Larkowll's design has been highly acclaimed, including being included in the "My Choice" collection of jury comments.

    How Larkowl works.

    Natural hair laminate structure established for stable posture and easy turning without pressure or pain.

    The natural wool laminate structure has two properties: pressure dispersion and support. Pressure dispersion is the ability of bedding to disperse body pressure, while support is the ability to support the weight of the body. Mattresses need to have both pressure dispersion and support. However, it is currently difficult to achieve both. For example, soft materials such as urethane provide excellent pressure dispersion, but there is room for improvement in support. Soft materials cause the body to sink into an unnatural posture and make it difficult to turn over in bed. Urethane materials absorb moisture but are poor at releasing it, making them unsuitable for the hot and humid summer months in Japan. Firm filling materials such as firm cotton provide excellent support, but there is room for improvement in pressure dispersion, which can lead to problems of pressure and pain.

    To solve this problem, wool-like natural hair of less than 60 mm in length and hair-like natural hair of more than 200 mm in length are blended with high-grade natural hair from camel, yak, horse and cashmere, in a laminated structure whose diameter becomes thicker towards the lower layers. The upper layers are softer and more cushioned due to the less transverse tension of the hair, while the lower layers are more elastic due to the more transverse tension of the hair.

    Thus, by using a laminated structure, both pressure dispersion and support are achieved, and a structure is established that allows for stable posture and easy turning without feeling pressure or pain. The natural materials used are free from impurities and cleanliness, and the fibres are activated by ionisation technology that has been internationally patented in Japan, the USA, Europe and other countries.

    The "Larkowl" is a made-to-measure mattress made to order, using luxurious natural hair.

    The "Larkowl" is designed to specifications by certified experts who provide in-depth consultation with each individual. Each product is fully custom-made by master craftsmen who are familiar with the materials and construction. The company is also eco-friendly, with Oeko-Tex certification, re-tailoring, replacement and disposal of materials and recycling of resources.

    A choice of cushion unit combinations is available

    Made of natural hair from camel, yak, horse and cashmere. Natural wool is excellent for temperature regulation, and its resistance to stuffiness and heat retention make it ideal for Japan, which has four distinct seasons. The natural hair has been cleaned of impurities and the fibres have been activated by ionisation technology. It has excellent support for the weight of the body and cushioning properties to disperse body pressure. The cushion unit is available in three different patterns on the right.

    Cushion unit materials used

    The top layer of the mattress is made from an abundance of natural luxury hair. Natural hair is a material known to be rich in heat retention, moisture absorption, moisture release and permeability. It promotes the stabilisation of temperature and humidity in the sleeping area without the steamy feeling of urethane materials.


    Made from the hair of the Dipterocarpus camel grazing in the South Gobi region of Mongolia. Its raw wool has excellent heat-retaining, moisture-absorbing and moisture-dissipating properties as it adapts to the harsh natural environment, where the summer climate reaches 45°C and the winter temperature drops to 40°C below zero. Camel wool has better moisture release properties than wool and can maintain an ideal humidity level of 40-50% at all times. Sleeping perspiration is absorbed 30% in the duvet and 70% in the mattress, making camel the most suitable bedding material. By placing camel hair on the top layer of the cushion unit, the mattress has both excellent moisture release and warmth without steaming.


    Yak is found in the cold highlands and mountainous regions, such as the interior of Mongolia. Yak wool, also known as Tibetan cashmere, is so soft and delicate that it is used as a luxury fabric. Its long, thick hair is also strong enough to be used for ropes and hats. Yak body hair is particularly suitable as a material for bedding due to its durability, heat retention, moisture absorption and wicking properties. The use of natural yak hair in mattresses, a mixture of tough, strong hair and soft, delicate wool, results in a mattress that is both warm, supportive and resistant to sagging. Yak hair, which has thicker fibres than camel, is used under the camel to provide more body support.


    In German-speaking countries, horsehair has long been used as a traditional luxury material for sofas, mattresses and cushions for luxury car seats, as the saying goes: 'The nobility use horsehair mattresses, the common people use straw'. Only a small amount of hair can be extracted from a single horse, making it an extremely precious material. It is characterised by its strong, supple, thick and long hair, which is used for violin strings. The luxurious covering of resilient, supportive and durable horsehair provides firm support for the body during sleep. It also has excellent ventilation properties, including the ability to regulate humidity and temperature.


    Cashmere is highly prized because it can only be obtained from cashmere goats that live in the natural environment of cold and hot mountainous regions, where only 150-200 g of cashmere can be extracted from each goat. Cashmere wool has a smooth, velvety sheen and a unique wet look, and is outstanding in terms of softness, texture, lightness and warmth. Cashmere wool is also extremely delicate compared to wool, which allows water to penetrate more quickly, making it highly absorbent and less prone to dampness. Iwata uses a method of mixing cashmere wool with camel wool to solve the problem of pilling (hair pilling caused by friction) when cashmere is used in mattresses that are subject to body pressure. This has resulted in a mattress that is softer and better at retaining heat than a mattress made solely from camel, while making the most of the advantages of cashmere.

    Core unit materials used

    A polyester core material with a laminated structure is used to provide thickness and durability as a mattress. The material is recyclable.

    Polyester I-Cushion

    I-cushion is the term used to describe Iwata's concept for non-spring polyester cushions. The polyester used in the upper and lower layers has a vertical fibre direction, while the polyester used in the middle layer has a horizontal direction. Moisture escapes through these vertical and horizontal fibre pathways. A mattress durability tester has been installed and compression tests have been carried out 80,000 times.

    ポリエステル I‐クッション(Polyester I-Cushion)

    Fabric is 100% cotton, original specification.

    Oxford weave fabric without resin treatment is moisture absorbent and wicking and supports a comfortable sleeping environment. Available in three plain dyed colours.

    Cotton oxford, white oak.

    Cotton oxford floral pink.

    Cotton oxford, white oak.

    Sustainable fasteners are used.

    The fastener used in LARKOWL, YKK's NATURON®, is a resource-saving, recyclable fastener that uses recycled polyester material for the tape or tape element part.
    *We will change the current fasteners as soon as they are out of stock.




    Binding thread colour available in red or white

    The upper and lower decorative tassels are available in white or red. The tassels are securely bound with a special needle several tens of centimetres long by a futon-making meister.

    Larkowl Red

    Larkowl White


    Special sizes other than the standard sizes can be made: the MH and ML types can be made up to 160 cm wide x 210 cm long and the MT type can be made up to 200 cm wide x 210 cm long.

    Tailoring is possible.

    After its useful life, it can be re-tailored and parts can be replaced, like a futon.

    Can be printed with the customer's name. [Free service].

    The custom-made mattress "Larkowl" is unique and only for you. We will put your name on it as a proof of your customisation.

    The science of sleeping comfort in Larkowl.

    About sleeping comfort in summer

    Comparison of temperature and humidity on the mattress between larkowl and urethane mattresses showed an increase in both temperature conditions, but a significant decrease in humidity in A. (Demonstration 1)

    Urethane had a stronger demand for cooler mattresses and more felt stuffy. (Demonstration 2) (iii).

    About sleeping comfort in winter

    A comparison of the temperature and humidity in the duvet between the Larowll and spring mattresses showed that the temperature increased in A. In addition, humidity was reduced in A. (Demonstration 1)

    *Presented at the 67th Congress of the Japanese Society of Physiological Anthropology *Reproduction of this data is prohibited.

    Larkowl was found to be warmer on the feet and more comfortable during sleep. (Demonstration 2) (iii).

    Larkowl line-up and specifications

    The combination of core and cushion units can provide the desired support and cushioning.

    MH type: standard model

    MD type: soft type model

    MT type: for those who want cushioning (model sold exclusively at directly managed shops)

    MH type (standard) [Mat height: approx. 20 cm] This product is used by many as a standard product of Larkowl.

    MD type [Mat height: approx. 20 cm] Soft, soft mats.

    MT type [Mat height: approx. 23 cm] Cushioning is enhanced by using 3D cushions. Suitable up to king size.

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