Sid's Leather Armor is an improved version of the regular Leather Armor. The heating system has been replaced with a heat-regulating system, so it can both heat and cool the body. It also has an advanced radiation filter. Sid was the nickname of one of the most infamous Agents in Rubi-Ka's history. Rumor has it he was the first man on the planet to use this version of the Leather Armor - and that he colored it red. So today this version only exists in red, for marketing purposes. Sid has not been spotted for ages.