Even with an electric fan on full blast, the efforts of a tough training session on the turbo trainer will soon have you building a sweat. This is why the Insider 2 Bib Shorts have been designed to be as light as possible and to be as breathable as possible, with no superfluous details needed. Castelli makes use of lightweight 195 g/m² Lycra for the body. This keeps bulk down, flexibility up and the excellent breathability needed to deal with your efforts. There are also mesh side panels, allowing for the cooling effect of extra airflow to come into play. Bib straps are kept minimalist, with an open-knit design aiding breathability. The raw-cut leg endings continue the minimalist theme, offering a smooth and comfortable fit without excess bulk. Inside the shorts, the Progetto X² Air Skin seat pad is ideally suited to indoor training, with excellent moisture control and a super-soft next to skin layer.