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Weighing only 123 grams and with the ability to fit into half of a pocket, the Idro Rain Jacket is the lightest rain jacket ever made but it doesn’t skip out on any functionality. Designed for the very worst conditions, the Idro isn’t just a quick protection cape to stop you getting wet for a certain amount of time, but a jacket to protect you in the worst conditions possible.

The Idro brings unprecedented levels of durable rain protection due to its Gore-Tex technology embedded within the construction and functionality is at an all-time high thanks to the attention to detail Castelli use within all their products.

An easy sliding waterproof YKK Vislon zipper and elastic bindings on the cuffs and hem keep the jacket in place, stopping any wind or water ingress from affecting your riding, plus a zipped opening on the back allows you to get to your rear pockets if you need to.

Reflective elements have also been incorporated to enhance visibility in low-light conditions, making this perfect for seasoned road riders looking to push their rides into the night or commuters who want more functionality out of a jacket.

Even weighing 123 grams, the Idro Rain Jacket features fully tapered seams to maintain its waterproofing through the most turbulent of weather and it still folds down into a pocket size, making it easy to stash in your jersey pocket should the sun start beating down.


  • The lightest rain jacket in the world, weighing just 123 grams
  • Constructed with highly-technical Gore-Tex fabrics
  • Unprecedented levels of durable rain protection
  • Easy-sliding waterproof YKK Vislon zipper allows for changing conditions
  • Elastic bindings on cuffs and hem keep the jacket in place
  • Zippered opening on the back allows for easy access to your rear pockets
  • Reflective elements are used to increase visibility in low-light conditions
  • Fully tapered seams increase waterproofing

Delivery Information

Hargroves Cycles offer Free Delivery for all orders over £9 with in Mainland UK (orders below £9 will be charged £1.99)

Bikes and Bulky items are sent via TNT Courier and smaller items are sent via Royal Mail 2nd Class Post.

Items over £50 are sent with Royal Mail 1st Class track able service which is emailed to the customer on the day of dispatch.
For full delivery details please see our Delivery Page

International Delivery

Hargroves Cycles delivery all across Europe. Goods are shipped from the UK and are subject to import duties where applicable

For further delivery, pricing and restriction information please view our International Shipping Page

Returns Information

We will happily exchange or refund any item purchased at Hargroves Cycles within 365 days, except gift vouchers and personalized products, except where faulty.

Returned goods must be unused and supplied with their original packaging, unless faulty.

For full details on our Returns procedure please visit out Returns Section.

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After a brief but promising cycling career, Maurizio created his eponymous brand in 1974 and a series of firsts would follow: the first Lycra shorts used in racing and sold to the public, the first colored shorts, the first sublimation printed jerseys, the first synthetic winter clothing, the first use of windproof membranes, the first hydrophilic fabric treatments, the first anatomic seatpad, the lightest jersey ever produced, and the most aerodynamic jersey ever produced. Maurizio’s vision was to be at the forefront of technology, performance and design. Maurizio Castelli died in 1995 while cycling up the Cipressa climb, the next-to-last hill in the Milano-San Remo course.

Today, Castelli is dedicated to continuing Maurizio’s dream: to create the most innovative clothing for the cyclist seeking maximum performance.