lady in a yellow changing robe and furry hat with moose antlers wearing a black knitted core warmer base layer, the Koji Luxe
black knitted core warmer, the Koji Luxe
black knitted core warmer in 4 sizes M, L, Xl and XXL
close up of a black core warmer, the Koji Luxe, showing the 5mm thickness

Koji Luxe core warmer

Regular price £19.00 Sale price£14.00 Save £5.00
Tax included. Shipping calculated at checkout.

  • Low stock - 8 items left
  • Inventory on the way

The Koji Luxe is an extra thick, snug and stretchy waist warming band. Inspired by the Japanese tradition of wearing a kidney warmer, the Koji Luxe is designed to add an extra-thick, insulating layer to your core to help heat you through after outdoor swimming. Lots of warm layers are the best way to heat up slowly after chilly dips and this wool-blend base layer is a perfect addition.

It's so easy to step into - so cold, fumbling hands are not a problem. It also doubles up nicely as a modesty cover as you easily pull it up over your boobs when changing.

Wear it next to your skin for a soft and super-warm base layer.

Get cosy in a Koji! 

Size Guide

The below is a guide but please note that the Koji Luxe is very stretchy and it is possible to sometimes size down for a snugger feel.


Waist in cm

Waist in inches

UK dress size





















Delivery & Postage Charges

The lead time between receipt of your order and dispatch is normally 24 hours, with a maximum of 72 hours. The brand will inform the Operator (The Outdoor Swimmer Shop) within 24 hours if they are unable to fulfil any orders received and we will contact you.

Shipping Charges to the Customer:


UK £3.99

EU £7.99

Rest of the World £14.99

Magazine (Only):

UK £1.00

EU £2.50

Rest of the World £3.50

We will only refund any shipping costs, including the cost of returning your goods, if we shipped an incorrect product or the product is found to have a genuine fault or is otherwise imperfect. Unsuitable wear or intentional damage will not be regarded as a fault. If you are claiming that your purchase was faulty, we will inspect your returned item(s) and let you know within 10 days whether we agree or if we regard the product as not faulty. 

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