Glycerin GTS 21 vs Hyperion GTS 2

The Glycerin GTS 21 is Brooks' plush daily training shoe with a layer of gentle support built in. GTS stands for Go To Support, so this is the stability sibling of the neutral Glycerin 21: same soft, high-cushion ride, but with guide rails that quietly hold your stride together when your form starts to wobble. At 289g with a 10mm drop, it is a substantial, protective running shoe rather than a light or fast one. That weight is the price of the cushioning, and it is aimed squarely at runners who value comfort and a bit of guidance over speed. We rate it as a soft-riding stability daily trainer for easy miles, long runs and everyday base training. If you overpronate mildly, want a max-comfort shoe that keeps you aligned, and are not chasing pace, it is one of the easiest shoes in this class to just put on and run.

The Hyperion GTS 2 is the stability running shoe for people who don't think of themselves as stability runners. Brooks took the light, quick Hyperion tempo shoe and added GuideRails support, so you get a shoe that wants to move at pace but keeps your stride honest when your form goes ragged late in a run. At 220g it is genuinely light for a supportive road shoe, with a 10.7mm drop and a moderate 33mm heel stack that leans firm and responsive rather than plush. This is not a max-cushion mile-muncher. It is a do-it-all trainer for overpronators who still want to run tempo, race a 10k or bang out a fast parkrun without dragging a heavy motion-control brick around. If you want the same ride without the support, the Hyperion 3 is the neutral sibling. We rate it as one of the more versatile lightweight stability shoes on the market.