Octave Boys Navy Thermal Thinsulate Hat - Warmth Without Bulk [Size 6-9 Years] OCTAVE Boys Navy Thermal Thinsulate Hat - The Original Warmth Without Bulk With 40g Thinsulate Insulation - Soft & Compressible / Recommended for high activity levels where wearer generates and builds a lot of body heat through activity-or-cool conditions Thinsulate insulation traps and holds body heat / Won?t absorb water Ideal for school trips, camping, hiking, snowboarding, skiing holiday or for those cold winter days Fibre Content: Shell: 100% Acrylic / Thinsulate Lining: 65% Polypropolene, 35% Polyester