The fibers are listed as:

• 70% animal fiber (50% merino wool, 20% kid mohair)
• 30% ProMix, which is a patented fiber blending milk casein and acrylic. Exact percentages of each aren’t publicly available.

毛70% プロミックス30% (メリノウール50% ・ キッドモヘア20%入り)