Petzl Spin L1 Color:Black It has ventilation holes with

It has ventilation holes with sliding shutters to allow airflow through the helmet

Internal foam flotation keeps the bag on the top of the water where you need it for rescue

EPP (expanded polypropylene) and EPS (expanded polystyrene) for reduced weight

That’s why it is made of up to 100 % metal - without any vulnerable synthetic spots

Petzl Spin L1 Color:Black It has ventilation holes withVery high efficiency single pulley with swivel Openable even when attached to the anchor, the SPIN L1 pulley is designed for maximum simplicity in setting up hauling or load deviation systems, and tyroleans. The large diameter sheave mounted on sealed ball bearings gives it excellent efficiency. The swivel facilitates handling, allowing the pulley to be oriented under load, and direct connection of carabiners, ropes or slings. Description Designed for