Screener GG Sneaker GS: “The Screener GG Sneaker GS by Gucci channels retro vibes with premium construction, featuring the iconic GG monogram and classic Gucci web stripe.” YOU ALMOST FIT TWO SIZES? For a tighter fit, go down one size.For comfort, go up one size. HOW TO MEASURE Follow these steps to choose the right size. To find the best fit, measure your feet at the end of the day. 1. Length : Measure the distance from the tip of the longest toe to the end of the heel.