the sidewalls are not reinforced like the vit or schwalbe or conti touring tires, BUT this makes the T-Servs a very fast tire. they are worlds away from marathon plus tires.
Despite the supple construction, the Protex protection belt makes these tires quite flat resistant where it counts.
I've ridden them extensively on tours, as well as off road for quite a few touring trips, use them near exclusively as a city tire, and have nothing but good things to say about their performance. I ride them on trails and gravel roads without much worry. Here's how they grip.
I worked the parts counter at a large independent and sold a lot of panaracer T-SErve tires for sporty touring. Reports were consistently good.