Why do all these weight 4 yarn have different thickness? (More in

Yarn weight - Wikipedia

Yarn Weight Chart, Chunky Yarn & More

Beginner's Guide to the Standard Yarn Weight System - Yay For Yarn

What is Fingering Weight Yarn Anyway? - TL Yarn Crafts

The BEST Yarn for Crochet Beginners: A COMPLETE Guide - sigoni macaroni

Demystifying Yarn Weight - SweetGeorgia Yarns

My Hat is Too Small! How Yarn Substitution Affects Gauge - Your Crochet Questions Answered - Kirsten Holloway Designs

A Beginner's Guide to Yarn Weights

Why are these both considered medium weight yarn? : r/crochet

Choosing the Right Yarn

Yarn Weights: A Complete Guide for Beginners! - DIY Candy

YDKWYDK: Deciphering a yarn label Welcome to the Craft Yarn Council

How to Read Yarn Labels for Beginners - Easy Crochet Patterns

Yarn Weights Helpful Explanation

Understanding Knitting Needle Sizes & Yarn Weights