This is a size XS Everlane Renew Fleece sweatshirt in Crocodile (light olive green) - super cosy and warm. I have worn it a handful of times and it is excellent condition - no stains, rips or tears.
From the Everlane site:
Our best-selling ReNew fleece gets even cozier. (You can thank us later.) The ReNew Plush Fleece Sweatshirt features a classic crew neckline, square hem detailing, and a ridiculously soft feel with an easy, boxy fit. Plus, it’s made entirely from 100% recycled polyester.*
*Except the trim. Currently, that can’t be sourced in recycled materials. (But we’re working on it.)
