As leaders in foul weather race kit, Castelli believes tech like water repellency should be integrated into more mainstream pieces of kit, and certainly shouldn’t be at the expense of breathability or comfort. The Castelli Imprevisto Nano Jersey is, on the face of it, a simple, pared down jersey with a great cut, and an extend sleeve length. However, the outer fabric has been treated with a water-resistant finish to provide weather protection for when summer rain rolls in or for when mountaintop fog can leave you shivering.
Think of it as a summer gabba - the jersey isn't windproof, a deliberate design choice, ensuring breathability and comfort in hot climates are still maintained - the Imprevisto still works well with a jacket over the top. The nanotechnology used to treat the fabric also means the Nano Jersey absorbs less sweat and works particularly well on humid days or when mountain top mist can leave you damp and cold as you plummet down the descent.