The Castelli #Girovirtual 2023 shirt was made for the rigors of indoor training. The 3D Mesh fabric allows maximum air breathability to keep you cool, while the 100% polyester content ensures maximum sweat absorption and dispersion. It's not too see-through in case you want to wear it for a group workout. Or, if you're using it at home and want to take it off after a bit of heating, you can easily do so thanks to the long zip. A couple of pockets have been added to the back to allow you to put in your AirPods or phone or headband or whatever you use during your workout. The low collar and short waist have been kept for maximum breathability. And if it happens to you, it can also turn into an excellent jersey for cycling outings on the hottest days of August.