Please see detailed pictures and feel free to ask questions. Smoke-free home. Brand new with tags. There is mesh around the shoulders for ventilation and there is a back pocket with a zipper to hold keys also has reflectors on the sleeves and on the back, perfect for running or any outdoor activity biking hiking. Beautiful bright color half zip does have a collar. Please see detailed pictures for exact measurements. Also has extra space for thumb holes on the sleeves. Super cute brand new jacket. Moisture wicking, material and fast drying athletic fit skim body not too tight. Some of the pictures almost look a little little bit green, but it’s definitely yellow.