Hydro GTX


• Insulated, waterproof Gore-Tex upper keeps feet warm and dry
• Wide neoprene cuff seals out the elements
• Slightly roomier fit accommodates thicker winter socks
• Four Velcro® straps
• Replaceable heel pad


Sizes 39-50

Winter commuting is hard. So is Winter training. But if you can tough it out, well, you’ll be a monster on the bike come spring. Which is why SIDI’s Hydro GTX is one of the best-kept secrets among early-season speedsters. Keep your feet warm and happy racking up miles on those lonely winter training missions, the ones that separate the hard riders from the fair weather cyclists. Weatherproof, breathable uppers keep your feet dry in all conditions. Make wintertime your training time, and get a jump on your early season fitness.



Image of Bootie test machine

Winter Tech

Hydro GTX and Diablo GTX employ a four-layer upper for optimal durability, weatherproofing and winter comfort. They feature, from the outside in:

• Tough exterior of Lorica® panels and breathable heavy-duty nylon inserts

• Seamless inner Gore-Tex® bootie for waterproof, breathable comfort

• Light insulating layer

• Soft inner liner


The gusseted upper fits snugly around the ankle, creating a waterproof barrier where ordinary shoes would allow water to enter the shoe around the tongue.

Winter Tip

For optimal comfort and performance the wide neoprene-and-Velcro® strap must be snug around the ankle, with tights or rain pants tucked around the outside of the boot.


The Gore-Tex® bootie is completely waterproof, so if water gets into the shoes—either from a loosely secured ankle cuff, or it’s wicked in by tights or rain pants tucked into the bootie—that water remains trapped inside the shoe. In that event your feet will probably stay warm, but they’ll be wet for the duration of the ride.


Gore certification isn’t for everyone— you have to adhere to rigorous test standards for immersion, pressure, and other parameters that add up to dry winter comfort. Our Diablo GTX and Hydro GTX boots are more than up to the task. And we have the machine to prove it.