More tees from 2018 in the Sega Shop. Here they have another set of tees where each one is 25 dollars, in adults sizes. They are all also classic style.
The first 2 are variants of each other, one on a dark gray, the other black. The "gold line art" is in reference to the geometric, detailed GHZ traingle seen in better detail (up close, etc) on other pages of Gear.
The third shirt is "Gold Crest" which is more of the very detailed almost Art Deco geometric type design that seems to be exclusive to the Sega Shop & only appeared in 2018.

The next two shirts are variants of each other, one in light gray, the other in dark. They have 'figure-8-peel-out' Sonic which was introduced in Sonic CD & the rhyme slogan "Born To Run Since '91". The last shirt is called 'navy', but it must be quite a dark one because it looks almost identical to the black shirt's tone above it. It's the most colorful, with 16 Bit pixel style flying Tails & running Sonic. They're on a floating bit of land from GHZ, & have a giant pixel ring with clouds as the background. This lot really shows their variety, with the use of neo-classic stylish art for the top 3, classic for the next two & a good use of 16 Bit for the last.