Work doesn€™t stop in the warm-weather months just because it€™s hot. That said, you can feel better about the dog-day swelters when you pull on a pair of Costello Tech Pants in the morning. Built with an ultra-light 5oz fabric, the Costello won€™t weigh you down in triple-digit temps. While they€™re plenty comfortable, these pants are sneaky tough. The fabric has a durable, mini ripstop nylon construction and is infused with four-way stretch, making it tough yet flexible.