Hotaru diagram


Meaning: Firefly –
Hooded HASU suit with front zip available in 5/4mm or 4/3mm

Made using a Fine Mesh durable and lightweight smooth-skin, lined in 6000 Yamamoto – the most flexible, stretchable lining available. The memory of our neoprene will retain full stretch qualities over 2000 times which prevents stretch-out in your wetsuit. Chest and back lined in Zirconium – dermalogical body warming material with very low water absorbency. Extremely light and durable – the best thermal lining on the market.

Chest zip entry with the zip pulling inwards which means there is no way it can open. Reinforced seams throughout the wetsuit, with 0.5mm Yamamoto taping on the arms and legs.

Advanced neoprene, a tighter cell structure so that less neoprene keeps you just as warm. Weights just over 1kg or 2.2lbs when dry and increases by 0.5kg or 1.1lbs when fully wet.

Drying time of 10 minutes in regular temperature of 65F.


Click here to purchase:

Hooded 5/4mm – | $549 | £375.00 | €450 |



HASU Wetsuits are made using Yamamoto’ closed cell foams and are all produced from 100% CR – Chloroprene Rubber. This is commonly known by most as Neoprene which is a DuPont trademark.

HASU & Nineplus use Yamamoto which


– Uniform cell structure
– Highest Heat Insulation & Warmth
– Lightweight & the lowest water absorption possible
– Super low modulus stretch with optimum cell recovery

– in regular terms you can stretch Yamamoto to its maximum over 2000 times and it will not bag out. Other neoprene has around 300 times and it loses it stretch. Worth noting next time the suit feels great for 6 months and then loosens on the elbows and the knees.

HASU & Nineplus wetsuits exclusively use Yamamoto rubber which is derived from Limestone and is over 99.7% calcium carbonate compared to petroleum based neoprene manufactured by other companies. Our neoprene is as environmentally friendly as possible. Not just in its makeup but mostly in the production technique which is the most damaging aspect of neoprene production. Yamamoto is the only rubber accepted into the medical profession and this is due to the environmental aspects of its production. Using calcium carbonate foam is much cleaner and more eco-friendly because it does not use petroleum as the important resource, instead it uses used car tyres. The heat used for processing and producing the raw materials is 1/10th of that being used for refining the petroleum based equivalent neoprene which most use. Furthermore the generated heat which is used in the neoprene production is then used to nurse eels, a major source of food within Japan. The source of the heat used in the factory is from burning used tyres within a controlled environment made possible using electricity derived from water turbines powered from the mountain streams. The way Yamamoto covert the limestone to neoprene is considered the most environmentally clean route in relation to how the product is generally made.

Yamamoto neoprene is not derived from petrochemicals in anyway, it is from limestone taken from the mountains within Japan in the same way concrete is made. There is estimated to be enough reserves to last another 3000 years so it is not a limited supply resource. By utilizing hydroelectric power the greenhouse gases are kept to an absolute minimum and by recycling the heat for farming the production process is as conservative as possible.