An In-Car Water Bath! Next-Generation Seat SPEEDER 'Shunrei' Cools Back and Buttocks Simultaneously with 75W Cooling Semiconductor and Cold Water Circulation, Pre-Release on Makuake!

Sankin Shoji Co., Ltd. (Headquarters: Oita City, Oita Prefecture) has pre-released its latest project under the car life brand 'SPEEDER' on the crowdfunding service 'Makuake'.

Ahead of the sales start on Friday, June 5, 2026, the next-generation in-vehicle cooling seat 'Peltier Water-Cooled Circulation Seat Shunrei' has begun accepting 'favorite registrations' on Makuake. We are unveiling the full picture of the latest solution that dramatically changes summer driving.

Clearing customers' 'two major concerns,' a challenge for further extreme cooling.

Our company has repeatedly developed in-vehicle cool seats driven by customer feedback. However, with the record-breaking heatwaves in recent years, we have received earnest requests from users saying, 'We want to feel the cold more directly, beyond the limits of fan-type blowers.' At the same time, we have also received many issues regarding compatibility with different car models, such as 'Because of my car's seat structure, I couldn't install conventional products properly.'

Development began to simultaneously meet these real needs for 'overwhelming cooling sensation' and 'compatibility with all vehicle types.' The next-generation water-cooled circulation seat 'Shunrei' was born, combining a powerful 75W Peltier element cold water circulation system with a tough, highly durable design that fits any car perfectly.

1【Overwhelming Cooling】'Ultra-Fast, Extreme Cold' Experience with Peltier Element x Cold Water Circulation System

This is the product's greatest strength, setting it apart from fan-type products that merely blow air. It applies Peltier cooling technology, also used in car refrigerators! Water cooled by a 75W 'high-output Peltier element' circulates through tubes laid out inside the seat. It directly and uniformly cools the back and buttocks, where heat tends to accumulate. Even after parking under the scorching sun, it instantly creates a comfortable driving environment.

2 High Durability x Supreme Sitting Comfort x Rapid Circulation. Specially Designed Proprietary Water Channels.

■ Calculated Water Channel Layout for Even 'Surface' Cooling Optimized water channel layout achieves a structure that efficiently cools the entire cooling area as a 'surface,' delivering uniform coolness to every corner of the back and buttocks, where heat and moisture tend to accumulate.

■ Achieving Both Supreme Sitting Comfort and Tough 'Load Capacity of 100kg' The unique water channel layout and special processing eliminate the lumpy feel typical of tubes, achieving both supreme sitting comfort and overwhelming toughness with a 'load capacity of 100kg' that withstands hard long-distance use.

■ Simultaneous Cooling of Seat and Backrest & 'Rapid Circulation of Just 18 Seconds per Cycle' with Specially Designed Proprietary W-Water Channel

The coolant cooled by the 75W Peltier element is sent simultaneously and rapidly to the 'buttocks' and 'back,' where heat tends to accumulate, through the specially designed 'proprietary W-water channel.' The speed at which it circulates the entire seat is just 18 seconds per cycle. With this overwhelming rapid circulation technology, even a seat enveloped in hot air under the blazing summer sun is cooled down quickly without making the driver wait.

3【Silence and Smart】Cooling Experience Unique to Water-Cooled Seats, A Quiet and High-Quality Space Without Wind

It solves problems common with conventional fan seats, such as 'the buzzing noise of the fan' and 'clothes flapping or puffing up from the wind.' Since this product uses a water-cooling method that cools without blowing air, it achieves an overwhelmingly quiet design with an operating noise of only about 40dB (equivalent to a low-noise fan for a PC). It seamlessly matches business use and luxury car interiors without interfering with in-car music, conversation, or phone calls. Furthermore, since it does not continuously blow cold air directly onto the skin, it is also ideal for those concerned about the strain on the body from air conditioning or dryness of the skin and eyes.

【Up to 35% OFF! Information on the Limited-Quantity 'Super Early Bird' Plan Expected to Sell Out】

To commemorate the pre-release of this project, we have prepared a limited-quantity 'Super Early Bird' plan with [up to 35% OFF], the most advantageous way to get the product. In past projects, the cheapest plans sold out within minutes of the sales start. Each plan is on a first-come, first-served basis and will end when the limited number is reached. To avoid missing out, we strongly recommend completing 'favorite registration (receive notifications)' from the project page before the sales start on June 5.

【Project Overview】

Project Name: 'SPEEDER Shunrei Seat'

Representative Product: Peltier Water-Cooled Circulation Seat 'Shunrei'

Project Start Date: Starts from 8:00 AM on Friday, June 5, 2026

Reward Structure: A total of 6 plans are available, from single units to quantity sets.

｜Company Profile｜

Name: Sankin Shoji Co., Ltd. (MITSUKIN SHOJI Co., Ltd.)

Established: April 2011

Representative: Shinichi Tanaka

Head Office Location: 3-1-35 Sekiden-cho, Oita City, Oita Prefecture

https://mitsukin.info/