All The Benefits Of The Classic Hydraform Handheld With Added Low Profile Storage And Insulation Sleeve. Ergonomic Design Allows The Hand To Completely Relax. Fully Breathable Airflow Ultra Soft Inner. Easily Adjusts To Fit Any Hand Size. Includes Ergonomic Hand-Formed 10.5Oz Or 16Oz. Bottle. All Amphipod Bottles Are Recycling Symbol #4 And Are Bpa-Free; Leak-Free Optimal Flow Spout Thumb-Lock Sleeve Design For Grasp-Free Carrying; Ergonomic Bottle Eliminates Hand Tension Integrated Insulator Sleeve - Removable For Cleaning; Adjustable Strap For A Perfect Fit Thermal-Lite Insulator Sleeve Is Designed To Add Insulation For Hot Or Cold Weather Use Many Athletes Carry A Hydraform Handheld In Each Hand For Balance, In Hotter Weather And/Or On Extended Runs/Events​​