Eisbar Ripp MÜ Winter Hat Properties: Stylish winter hat made of polyacrylic knit fabric provides excellent thermal insulation and comfort. The ribbed structure, outer cuff and regular fit accentuate its simple design.;Eisbar Ripp MÜ Winter Hat Properties: Stylish winter hat made of polyacrylic knit fabric provides excellent thermal insulation and comfort. The ribbed structure, outer cuff and regular fit accentuate its simple design.