Get a free plastic ring sizer and fill out a form to be able to request for one. They'll be sending your ring sizer in standard mail with a stamp, untracked. 

This is being sent within the USA only. This may take a week to get to you. 

Please do not send another request if it doesn't show, just hit them with an email.

Midwinter. co is offering a free plastic ring sizer that can fit multiples hands and fingers. The ring sizers are little pieces of reusable plastic. 

Although they are small, every little bit adds up to a lot. Midwinter.co are working on lessening plastic use and offering eco-friendly options are a step forward in that goal.