Giesswein Ultra Comfort Blue Wool Slip On Slippers. Giesswein made from high-quality wool. The shoe is equipped with soft and warming wool on the inside. The softly padded textile insole is replaceable and thus creates space for your own insoles. The shoe shape is ideal for feet of normal width. The heel is flat throughout and a non-slip, low-abrasion rubber is used as the sole material. The square-shaped shoe shape has two advantages: It looks sporty and is comfortable for the foot and toes. The shoe size is regular.