PoE2
Hypothermia
Support
Cold
Cost Multiplier: 120%
Requires: Level 1
Supports any skill that Hits enemies, making it more effective at Freezing Chilled enemies.
Place into a Skill's Support Gem socket in the Skills menu to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
PoE1
Hypothermia Support
Cold
Support
Level: (1–20)
Cost & Reservation Multiplier: 130%
Requires: Level (31–70), (52–111) Dex
Supports any skill that deals damage.
Supported Skills have +20% chance to Freeze Enemies which are Chilled
Supported Skills deal (20–29)% more Cold Damage Over Time
Supported Skills deal (20–29)% more Damage with Hits and Ailments against Chilled Enemies

Additional Effects From Quality:
Supported Skills have +(0–20)% chance to Freeze Enemies which are Chilled
This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Skill Gem you wish to augment. Right click to remove from a socket.