When taking a walk on Gamsguber-weg or any of the parking-lots of Grossglockner-Hochalpenstrasse you wont need special shoes, BUT as soon as you decide to go for a hike bejond the asphalted paths, you certainly need good hiking equippment including real mountain-boots, a weather-gear, some food and a lot to drink. Wells with fresh mountain-water for free might be found easyly close to the parkinglots, in the mountains you will never find them that way, but you might fill your water-bottles directely at one of the many tiny mountain-rivers along the hiking-paths.
The weather may change quickly from one minute to the other and it might be sunshine at the northern part of Grossglockner Hochalpenstrasse and storm and snow at the southern part, south of Fuschertoerl or vice versa. Above 2000 meters sealevel it may snow even in the best summertime, when it is just raining in lower parts of Austria.
For that reason it is also absolutely necessary to take some weather-gear, when taking a hike in that area, all of a sudden clouds could pass through the area you are walking and then you will get totally wet, even though it is not at all raining, but the haze of the cloud is making you wet all over. In this area the clouds are most likely touching the surface and you will experience nature in a very special way.So an umbrella is never sufficient in the mountains, you need something that covers almost all your body & clothes !