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The new Alpha Jacket is windproof and water resistant thanks to Windstopper’s 150 material. But the real innovation on this jacket is the detached insulating layer which stays close to your body when you unzip the jacket so your core doesn’t get blasted with cold air.

Throw out everything you think you know about cycling jackets and redesign the way a jacket should be made. Or possibly how they’ll all be made in a few years when everyone else follows our lead once again. With the Alpha, we’re introducing several new techniques and fabrics to construct a lightweight, cool and cold weather jacket.

We’ve focused on two perennial problems with cycling jackets and wind jerseys. First is ventilation. With our latest fabrics we can essentially build a winter jacket that will keep you warm in all but the most extreme conditions with just a base layer underneath. But when you open the front zipper you get a blast of cold air at the top of your chest, while the rest of your body remains too hot.

In Alpha we’ve detached the insulation layer from the windproof layer so that you can open the windproof layer to let air in to ventilate and help evaporate moisture. Riding these pieces shows how effective it is at regulating temperature and comfort while helping to keep you drier.

The second focus area is all the openings. At the waist we have a new fabric and construction that lays completely flat, is streamlined for aerodynamics, yet when you drop into the riding position it follows your body without binding or billowing. At the wrists we have a new flat raw-edge construction that interfaces perfectly with our gloves to keep drafts out and to improve comfort. At the collar we have a new articulated construction that follows the bends in your neck whether you’re standing or riding in the lowest aero position.

  • Windstopper 150 fabric is windproof and water resistant
  • Dual layer construction creates better ventilation, moisture evaporation and breathability
  • Asymmetric YKK Vislon zipper lays flat and slides easily
  • Raw edge waist follows the body lays flat and is low bulk
  • Raw edge wrists create a perfect interface with Castelli gloves
  • The stretch fabrics combined with the latest advanced patterning creates a close fit on a wide range of body types
  • Back ventilation for greater comfort
  • Castelli silicone grippers
  • Front zippered key pocket
  • 3 large open rear pockets
  • Zippered rear pocket with reflective webbing

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.

  • Castelli Alpha Jacket