For over 33 years, Nike Air Max shoes have been some of Nike’s best-selling sneakers. Recent innovations like Vapormax and Air Max React have kept the Air Max line at the forefront of performance footwear, while classic silhouettes like the Air Max 1 and 90 have been given a new life through fresh colorways and collaborations. Yet with all of the different Air Max models that consistently release year after year, it has been unclear which silhouettes are the most valuable on the resale market.

StockX crunched their numbers to find out which Air Max silhouettes are flipping at the highest premiums and why these decade-old silhouettes are still relevant in today’s industry. They discovered that out of all Air Max silhouettes, Air Max 180s have shown the greatest surge in value in the past year. Also, StockX’s data showed that one of last year’s biggest Air Max releases is now more affordable than ever before.

Read the full analysis here.