Keis B601RP UltraFlex

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The B601RP UltraFlex Heated Bodywarmer is a new, powerful (41W) heated bodywarmer that can be worn as a very thin mid-layer. It has the same heating system as the new J601RP jacket, but without the arms. This waistcoat is for bikers who want to keep their torso warm but don't need heating elements on their arms. It's so slim that it slips neatly under a leather motorbike jacket that's a little tight, making it ideal for roadsters, sportbikes, customs and other neo-retro bikes.

The unique UltraFlex fabric also offers generous stretch in all directions, moulding the garment to the contours of the wearer's body for a snug fit but without restricting movement. The fabric is lightweight, breathable and moisture-wicking, keeping the biker comfortable and dry, while Keis heating panels provide warmth to the chest, back and collar.

Thanks to its intense heating system, this new heated waistcoat falls into the category of motorbike jackets rather than outdoor waistcoats. Its main power source is the motorbike battery, thanks to the cable supplied.

All the technical information and demonstration videos concerning the connection, power supply and heating of our jackets can be found here.


  • Unisex fit
  • The latest heat-generating technology, using micro-carbon fibre for extreme comfort and reliability.
  • The unique UltraFlex fabric offers generous 4-way stretch, moulding the garment to the contours of the wearer's body for a snug fit without restricting movement.
  • The fabric is lightweight, breathable and moisture-wicking, keeping riders comfortable and dry.
  • Designed to be worn as an inner mid-layer.
  • Dedicated zipped pockets for cables and standard power controller to keep everything tidy and easy to find.
  • Practical lifestyle pockets for added convenience.
  • Strategically positioned thermal panels on the chest, back and collar provide extreme warmth.
  • Supplied with all the necessary cables and full, easy-to-follow instructions.
  • Fitted with underarm power sockets and integrated into the inner waistband: these allow you to connect and power a pair of Keis heated gloves (using the power leads from the waistcoat to the glove), and/or Keis heated trousers, socks or insoles.
  • Available in black, with red piping, and complete with motorcycle/vehicle wiring harness.
  • Current consumption 3.4A. Typical power 41W. Note: this value may vary depending on the size of the garment.


  • 1 B601RP heated jacket
  • 1 cable for connection to 12V vehicle battery
  • 1 temperature controller
  • English instructions


Choose your usual size from the drop-down menu next to the blue "Add to basket" button. If in doubt, you can also measure your torso/chest circumference and choose your size from the table below.

If you're not sure between two sizes, we recommend taking the larger one. For example, if your torso/chest circumference is 103 cm, choose the jacket size 105 cm, i.e. M.


If the size you receive doesn't fit, you can of course exchange it free of charge. Just send us an email and we'll send you the procedure for printing out a returns slip and dropping off the parcel at a delivery point near you. After receipt and inspection, we'll send you the new size free of charge.