specification

Outer cover: Heavy-duty cotton / canvas fabric

Inner filling: Silica gel or bentonite clay

Heated in hydrocollator unit at 70–75°C

Retains heat for 20–30 minutes

use time duration: 15–20 minutes per session

Small: ~5× 12 (12 × 30 cm)

Medium: ~10 × 12 (25 × 30 cm)

Large: ~10 × 22 (25 × 55 cm)

Cervical: contoured (~24 length)