The 4S concept

“4S produces quality shock mitigation seat bases and associated products – focusing on the essentials, to make them affordable for All boat owners”.

Your Spine will Thank You!

All you need between your seat and the deck.

The widest assortment in the marine industry; 12 product lines with 35 options.

Strong, rigid and durable with easy access to functions.

For all 4S products, the development strategy includes long-term-processes with attention to:

  • Analyzing customer needs
  • Different kind of driver ergonomics in boats
  • Selection of suitable materials and methods
  • Development of optimal compression/rebound profiles
  • Testing in different types and sizes of waves
  • Testing in different sizes of boats
  • Repeated impact- and endurance tests
  • Building up an efficient, reliable supply- and manufacturing process
  • Making sure +85% of the products can be manufactured in-house

As a result of this thorough process, Scandinavian Seat Suspension Systems (4S) has created several product lines without compromising on the quality in any detail or function.
Reliable products, with easy access to adjustment handles and -levers.
Sturdy products, with easily understood and maintained functions – avoiding small and sensitive details/handling (valves, loose parts, tiny adjustment wheels, sensors, electrical components, etc).
Affordable products, making it possible also for private owners of smaller boats to have a comfortable, pain-free ride in rough waters.
The 4S shock mitigation seat base minimizes the risks of pain and permanent injuries from wave impacts, and will make the overall boating experience safer and more enjoyable.

The driver seat should normally NOT be moving when the boat passes small waves and softer sea, as a moving seat affects the ability to feel and maneuver the boat in a safe way.
The spring should just about carry the full body weight in highest position. Not much more/less. The occupant can check this by lifting his/her body 3-5cm above the seat and drop down. The seat should then compress 1-2cm – not more – and then return back to top position.
See diagram below, and read more about how impacts affect you, what you can do to prevent injuries, and risks involved with low-quality, in-adequate seat suspensions, under Why Shock Mitigation.

Shock absorption overview – compiled by SICS (Swedish Institute of Computer Science)

Blue: Impact force on a normal, fixed seat base
Yellow: Impact force with 4S Titanium shock mitigation seat base

The diagram shows a short 2-minute drive in medium rough conditions.
Covering impacts up to between 5 and 6G a few times.
Note that shock absorption efficiency increases the rougher the impacts are.
Tests were carried out with Racefox® accelerometer sensors under seat cushions.