If you're new to Vivo we recommend you size the same as you would with your existing footwear. Our footwear fits 'bigger' deliberately - there should be a thumb width of space around the 'toe box' separating your toes from the footwear. If you're in-between sizes, we recommend you size up.
If you've been wearing barefoot footwear for a period of time, you may notice your feet start to grow as your toes splay to a more natural shape and size; over time you may need to increase your footwear size.
Our footwear fits consistently to each other as per the sizing charts below, unless otherwise stated in the product description.