Flynit Vapormax with Removable Gaiter
When it's wet outside, you want a waterproof shoe and when it's dry you prefer one that's not waterproof. But you don't want to be carrying two shoes, especially when you're running. If that's the case, you might want to consider the Nike Air Flynit Vapormax Gaiter ISPA.
ISPA is short for Improvise, Scavenge, Protect, and Adapt. It's a team at Nike that's making improvements to existing models.
Traditionally, the Flynit upper is susceptible to water intrusion so the iSPA team wrapped it in a removable gaiter that extends beyond the ankle, turning it into a lightweight hiking boot/running shoe hybrid.
When you don't need water protection, you can simply take off the gaiter and put it in your pocket. You can now run in a super breathable shoe that feels airy and light.
This is one of Nike's most-researched and tested model and is now improved by the iSPA team. It's light, breathable, and bouncy. You can make it weather resistant with gaiter on and put the gaiter in your pocket when you don't need it.
Update: This product is no longer available.