Saucony Guide 18 Sizing Guide: Does It Run Small or True to Size?

Fit Notes

ASICS GT-2000 13 / 14

Lengthwise, both models align perfectly with standard athletic sizing. However, ASICS models traditionally fit narrower and tighter through the midfoot and toe box. Transitioning to the Guide 18 provides immediate lateral relief and an inherently roomier forefoot while maintaining the same length. Runners who routinely size up in ASICS models solely to compensate for width restrictions should return to their true length size (TTS) when purchasing the Guide 18 due to its wider-than-average standard last.

HOKA Arahi 7 / 8

Both shoes conform to standard TTS metrics in length. While HOKA models utilize a wide structural base, they can frequently feel restrictive in overall vertical volume. The Guide 18 matches the spacious nature of the HOKA toe box while offering superior ventilation, but introduces a noticeably tighter, more secure lock through the midfoot arch.

Brooks Adrenaline GTS 24 / 25

Lengthwise, Brooks and Saucony remain completely equivalent. The primary differentiation is found in the midfoot architecture: Brooks typically features a more relaxed, roomier midfoot volume, whereas the Guide 18 delivers a performance-oriented, snug midfoot wrap designed to aggressively prevent heel slippage while still leaving ample room in the toe box.

New Balance Fresh Foam X 860v15

Both models translate identically in terms of pure linear length. However, New Balance shoes are notoriously spacious and wide across all standard D-width lasts. Moving to the Guide 18 preserves your length, but the midfoot and heel counter will feel significantly more secure, wrapped, and structurally locked-down.