Castelli Radiation Insolito jacket review

Space blanket magic

Our rating 
4.0 out of 5 star rating 4.0
GBP £300.00 RRP | USD $499.99
Castelli Radiation Insolito Jacket

Our review

If you want warmth it really works, but at a price
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Let’s get the  price out of the way first – £300 seems a silly amount of cash for a jacket. But, and yes there is a but, if that jacket is incredibly versatile, the only one you’ll ever need, then maybe such an investment isn’t quite so daft?


The outer of the Radiation Insolito isn’t groundbreaking and on its own doesn’t justify the spend. It’s a light, snug fitting, stretchy, well proven, breathable and water repellent Gore Windstopper shell with plenty of pockets, vents for breathability and removable arms for conversion into a gilet.

The ‘magic’, though, is on the inside – there’s a perforated silver ‘space blanket’ liner. Why? Well it reflects back your body heat to keep you warm. It really does work and even on the coldest days this winter the Radiation kept us toasty warm.

However, unless the temperature is constantly around freezing, it doesn’t take long before it gets too warm. The liner is removable, though, and stashes into a rear pocket – as does the removable Lycra hood. (Zipping the liner back in during coffee stops worked a treat.)


Our Radiation liner was long-sleeved and felt a little uncomfortable against bare arms, but a sleeveless version is an option. In the UK the Insolito comes in any colour as long as it’s black, but it does have  reflective detailing. (There’s also the £250 Quantum without zip-off sleeves and hood which comes in white.) So, is the Insolito  worth £300? Well, if you’ve got it …

Product Specifications


Name Insolito Radiation Jacket (09)
Brand Castelli

Clothing Material Windstopper Material
Clothing Sizes Available L M S XL XXL
Available Colours Black Red Yellow
Reflective Piping/Accents Yes
Water-Resistant Yes
Windproof Yes
Thermal Insulation Yes