Swag comes in lots of forms, from the popular t-shirt option, ubiquitous stationary supplies, stickers, and toys to name a few.
This discussion is dedicated to SOCKS!

Share photos on your swag socks.
Here is my personal collection mostly from Summit 2019.

The X-Matters socks were from ITX in 2018 but get an honourable mention as they had 3 sizes of socks!