ULTRAFLEX J601RP Heated Jacket

Keis Heated ApparelSKU: W54-373903

Size: 46 (90CM/36IN) 2XS
Sale price£220.00

Shipping calculated at checkout


New heated mid-layer garment designed from the ground up, using specially designed textiles and an enhanced heating system.

This new Heated Jacket has been designed to deliver maximum comfort and superior heating efficiency - featuring UltraFlex technology. This J601RP heated UltraFlex jacket features a much thinner material structure than the alternative soft-shell J501RP and J505RP heated jackets - being designed to fit between the wearer's base-layer and their outer motorcycle jacket when there is not a lot of space to accommodate a mid-layer heated garment. The unique UltraFlex material also provides generous elastic 4-way stretch, moulding the garment to the wearers body contours for a snug fit, without restricting movement.

UltraFlex 4 way stretch

Keis developed UltraFlex specifically for motorcycle mid-layers, so that riders can enjoy riding safely in colder environments. The fabric is lightweight, breathable, and wicks away moisture, keeping riders comfortable and dry, while the Keis heating panels deliver warmth to strategically positioned areas of the body.

The unisex Keis UltraFlex Heated Jacket delivers 65W (5.4A) of power to heat panels in the chest, back, sleeves, and collar. The sleeves also feature thumb holsters to prevent the sleeves bunching up, especially when putting on a motorcycle jacket.

Keis UltraFlex heated jacket

What makes the J601RP Keis UltraFlex Heated Jacket unique:

  • This heated jacket incorporates the next-generation heating and textile technology for heated garments - featuring UltraFlex technology.
  • The very latest Micro Carbon Fibre heat pads for advanced heat radiation, providing an even layer of heat across the chest, back, arms and collar areas.
  • The sleeves also feature ‘thumb holsters’ to prevent the sleeves bunching up, especially when putting on a motorcycle jacket.
  • The J601RP UltraFlex heated jacket features power output sockets in the cuff of both arms, and built in to the inside waist band. These allows the user to connect and power a pair of Keis heated gloves, and/or a Keis heated trouser, socks, or boot insoles. Add these additional heated garments to your jacket, to build your luxurious fully integrated heated solution.

 What you get with the J601RP UltraFlex Keis heated jacket: 


See here for the 2023 Keis Apparel Heated Clothing Instructions Manual


This Keis heated jacket comes with a FREE Keis Power Controller, or upgrade for a Bluetooth Controller:

Option 1:

Receive a FREE Keis Standard Power Controller with your J601RP heated jacket - valued at £38.

Simple add your size jacket to your cart, and we will automatically send you a FREE Keis Power Controller with your jacket. No need to add the Power Controller to your cart.

Option 2:

Upgrade to a Keis Bluetooth Controller with your J601RP heated jacket, for only £22.20 (£18.50 excluding VAT) 

Simple add your size jacket to your cart, as well as a Keis Bluetooth Power Controller, and we will automatically upgrade your free Power Controller to a Bluetooth Controller, for just £22.20 (including VAT).
PLEASE NOTE: When you pay for the upgraded power controller, you will only received the Keis Bluetooth Power Controller, and not the Standard Power Controller.




Size Guide

Available heated jacket sizes:

90cm / 36" 2XS 36 46 36
95cm / 38" XS 38 48 38
100cm / 40" S 40 50 40
105cm / 42" M 42 52 42
110cm / 44" L 44 54 44
115cm / 46" XL 46 56 46
120cm / 48" 2XL 48 58 48
125cm / 50" 3XL 50 60 50

keis jacket and vest size guide

Due to the elasticated side panels you may find you may experience a snug fit. A snug fit provides the most efficient transfer of heat from the heated jacket, through your required under layer (e.g. long sleeved t-shirt), to your upper body.

Not sure which size will best fit you? No problem.

We have an easy solution. This Keis Apparel website offers FREE UK return postage for any item purchased from this website, within 30 days. 
Please note: As of this time this service is only possible for returns coming from the United Kingdom, not for any other country.

So if you are unsure what size will best fit you, you can simply order more than one size, then return the one/s that do not fit using our COLLECT+ free return service within 30 days, and we will credit you for the returned items.

Go to the Keis Apparel website UK returns page here.



  • The very latest heat generation technology, using Micro Carbon Fibre for extreme comfort and reliability.
  • The unique UltraFlex material provides generous elastic 4-way stretch, moulding the garment to the wearer’s body contours for a snug fit, without restricting movement.
  • The fabric is lightweight, breathable, and wicks away moisture, keeping riders comfortable and dry.
  • Designed to be worn as an inside mid-layer.
  • Dedicated zipped pockets for cables and Standard Power Controller to keep things tidy and easy to find.
  • The sleeves feature ‘thumb holsters’ to prevent the sleeves bunching up, especially when putting on a motorcycle jacket.
  • Convenient lifestyle pockets for increased practicality.
  • Strategically positioned heat panels on chest, down the back, arms and collar provide extreme warmth.
  • Complete with all required wiring and full easy to follow instructions.
  • Available in all Black, with red piping, and complete with motorcycle/vehicle wiring harness.
  • Current Draw 5.4A. Typical Power 65W. Please note: This may vary, depending on the size of the garment.


    Voltage: 12V
    Approx. Current: 5.4A*
    Typical Power: 65W*
    Shell: 85% Chinlon, 15% Spandex
    Lining: 100% Polyester


    *Please note: This may vary, depending on the size of the garment.

    The Keis J601RP UltraFlex Heated Jacket features a Lifetime Warranty on all heating panels.

    Connect & power

    It is recommended that you power the J601RP UltraFlex Heated Jacket from a vehicle battery, using the supplied Keis Power Lead.

    While this heated jacket can technically be powered by a Keis Portable Battery Pack, we believe that this may not be very practical. As the heated jacket draws 5.4Amps of current to heat the many different Micro Carbon Fibre heating elements, a portable battery is not recommended to power this garment. It is advised that this heated jacket be powered from a vehicle battery connection.

    This heated jacket can also be powered via the Keis Cigarette Lighter/DIN Power Supply Lead (available as an optional accessory).

    Connecting the supplied motorcycle power lead is quick and easy.

    SPECIAL NOTE - You are unable to power this heated garment using a cigarette lighter/DIN power lead on a BMW motorcycle, due to the 5Amp limit to their DIN power socket (the jacket draws 5.4Amps).

    Powering your Keis Heated Jacket from the supplied motorcycle power lead.

    Connecting and using your Keis Power Controller with your Keis Heated Jacket.

    Connecting your Keis Heated Jacket to Keis Heated Motorcycle Gloves.


    Customer Reviews

    Based on 11 reviews

    Grate quality, lovely and toastie, definitely a must in cold weather. Bit of a faff plugging in at first use, but now I couldn't do without it.

    Clive Proctor

    This is a lot thinner than the 505 jacket, so less going on, under your MB jacket.
    It is really hot once on and easy to control, with the controller... (very hot without it)
    If it gets warm on the day, it is a thin layer, so your not sweating, with Two jackets on..
    I wear with a long sleeve T shirt and MB only...
    Get the size down, so its a tight fit..... very stretchy material on this too...

    David Cloughton
    Game changer

    Have now got full set up. Socks,trousers, jacket and now short gloves. Game changer when cold. Excellent quality. Can now stay out on bike for hours .when cold

    Russell Thompson

    I ordered the size as per the size guide and the jacket was a very nice fit.
    Wow this jacket is hot, I wore a thin base layer under it and took out the thermal liner in my motorcycle jacket, so I could give it a good test on a very cold day. I started on the medium setting and initially didn't feel much heat, so I put it on to full power. Had to stop 5 mins later to turn it to the medium setting, and then stopped again after another 5 - 10 mins to turn it to the lowest setting, which proved to be nice and cosy. Very impressed with this jacket and I am going to order the trousers to go with the gloves and socks I purchased with the jacket (reviewed separately)

    David Selcon
    Keis heated jacket

    An excellent product. I initially thought there was an issue with the heat controller - but it turned out that it was ‘operator error’. However, the personnel at Keis were extremely helpful and thorough, and the ‘issue’, ( me not holding the power on switch down for long enough!), was quickly identified.
    Only used it once so far, but it was plenty warm enough on the lowest setting. I’m looking forward to trying it during our next really cold spell.

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