GTS stands for GuideRails™ Technology System. GuideRails™ are two pieces of firmer foam placed on either side of the heel, creating a support system that helps keep excess movement in check. Any Brooks shoe with “GTS” in its name includes GuideRails™ and belongs to our structured support category—one of four support types we offer. You can learn more about each support type here.
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GTX refers to GORE-TEX®, a waterproof technology that helps your feet stay dry and comfortable in wet conditions—great for rainy runs or puddle-filled trails.