In Better Call Saul season 5, episode 8, "Bagman", Jimmy McGill has to conquer his fears and trauma regarding his brother Chuck - in the form of wearing a space blanket. Chuck McGill (Michael McKean) was one of Better Call Saul's main players across the show's first three seasons, having an antagonistic relationship with his younger brother, Jimmy (Bob Odenkirk). Chuck's death at the end of season 3 was a major turning point for both the series and its title character, further pushing him down the path to becoming Saul Goodman.
That transformation has been taken further than ever in season 5, which makes sense given Better Call Saul will end with season 6. Jimmy, or rather Saul, has started working for the cartel, dragging him deeper into the criminal underworld that will eventually become his natural habitat as seen in Breaking Bad. His work for Lalo Salamanca (Tony Dalton) in particular signals trouble, which is the case in "Bagman", when a mission to collect bail money for his new client goes horribly wrong.
Having picked up the $7 million for Lalo from the Salamanca cousins, Jimmy heads back but is attacked by members of the cartel (likely on Lalo's own orders), before being saved by Mike. That leads to the pair wandering around in the desert, trying to lose the tail of a surviving member of the gang who attacked Jimmy. When night falls and the temperature begins to drop, Mike pulls out a space blanket to keep warm, offering a spare to Jimmy. He steadfastly refuses to take it, despite clearly being cold, and it's clear this is because it's such a stark reminder of Chuck - who, of course, was frequently clad in foil. By the end of the episode, though, Jimmy does wear the space blanket, showing just how much the experience in the desert changes him, but not necessarily for the better.
At the very end of Better Call Saul season 5, episode 8, Jimmy is about ready to give up. With no food, nothing to drink but his own urine, and sheer exhaustion from walking, the heat, and carrying two bags with $3.5 million in each, it's difficult to go on. After a rousing speech from Mike about doing these things for the people they love, however, when the tail comes back around, Jimmy has a plan. Putting on the space blanket, he makes himself an easy target - serving as bait so that Mike can kill the man behind the wheel. It's a risky move, but it works, and shows Jimmy overcoming his fear of Chuck and the illness that defined parts of both their lives.
While he's overcoming his fear of Chuck - and fear of the pain that surrounds his memory - at the same time this also serves as something of a breaking point for Jimmy (well, another one). The moment he decides to get up in that desert, drink the urine, and put on the space blanket isn't just a choice to beat Chuck, but to become less Jimmy, more Saul. That serves to make it easier to face that fear of Chuck, because that's something so intrinsically linked to Jimmy, not Saul. He casts the blanket off at the end - it's even trampled on by Mike - which is like casting off another part of himself. This episode also sees the destruction of Jimmy's car and his world's best lawyer mug, meaning that a lot more of Jimmy has disappeared on Better Call Saul.