The outer material feels like wool, somehow Rau. The inner material is incredibly soft, probably a microfiber. It also does not pill. The seams are well made. At the two outer sides and between the outer compartment and inner pocket an approximately 5mm thick foam layer is incorporated, probably fairly well protects the tablet against pressure and impacts on the display.
Why still only 3 stars? Although the display and back of the tablet are relatively well protected, but unfortunately has the Sleeve no padding on the sides. Here a fall is offset by only one layer external and internal materials. The edges of the tablets are therefore without padding directly to the edges of the sleeve to the flatter the tablet the more it slips closer to this.
Seriously, this disadvantage is not, after all, the Sleeve with Tablet is indeed mostly in a pocket. But a clever-designed sleeve would not have this disadvantage. But perhaps one should the case of a 13 product not expected. All in all, this sleeve has a good price / performance ratio.