Question: What problem did the foam used for making the cape present in  Batman Begins?
About the article "Batman Begins", section "Batsuit".

Candidate passages:
As different artists have taken over the responsibility of drawing the character, the details of the suit have changed considerably.
The original incarnation of the cape was a wing-like structure that may have been inspired by drawings by Leonardo da Vinci.
This eventually evolved into a more cape-like design of varying length.
Some artists draw the cape with protrusions on the shoulders, likely representing the "thumb" part of a bat's wing, though this is not a consistent addition.
The cape is occasionally depicted as bulletproof.""
The cape varies according to the current writer, sometimes being depicted as bulletproof and fire resistant, and other times being nothing more than simple fabric that tears easily and sustains constant damage and is continuously replaced.
For example, in the ' episode "Robin's Reckoning", Batman fell through a floor heavily compromised by machine-gun fire and landed badly, hurting his leg.
He ripped up his cape and used some pieces of broken wood to make an impromptu ankle splint.
In the video games ' and its sequel ' the batsuit is damaged many times over the course of the game, the cape being torn and ripped severely, although it appears to provide protection against gunfire in the first of the two games, preventing attackers from shooting Batman in the back when walking, gliding, or swinging between various vantage points throughout the game.
This feature of Batman's cape, however, is not present in '.
The cape may also incorporate Nomex fire-resistant/retardant material (as demonstrated in the film "Batman Forever" and the Knightfall novelization by Denny O'Neil) and a Kevlar weave to slow the impact of bullets.
In "The Dark Knight Strikes Again", the ends of the cape contained razor-sharp blades which Batman used to slice through several corrupt government officials.
In the 2005 film "Batman Begins", the cape was also used as a sort of wingsuit; when an electric current was applied to the cape, the shape-memory fibers (much like Shape memory polymer) aligned into a semi-rigid form resembling a bat's wings, allowing Batman to glide over the streets and rooftops of Gotham.
A hang-glider version of this concept was presented in "Batman Returns", in which a harness folds out of the cape to make it a rigid wing-like structure, then folds back when the wearer rolls forward on the ground after landing.
In the show "Justice League" Batman ejected from the Batplane with his cape acting as a parachute using a harness.
After Dick Grayson took over the identity of Batman, he and Damian Wayne, the new Robin and Bruce Wayne's biological son, developed a "para-cape" for their costumes which gives them an ability to glide.
However, at the beginning, Grayson finds that the new cape has too much weight.
The also gave Batman the same gliding ability as in "Batman Begins".
In the 2010 comic book mini-series "Batman Beyond", Dick Grayson explains that there is also a tactical reason for adding a cape to the costume: misdirection.
It "hides the body, makes it difficult to know where to strike" when Batman moves, with the result that villains attacking him at long range cannot determine whether they are shooting at Batman's body or just the cape.
However, a flashback reveals that after armor-piercing rounds from the Joker's gun penetrated the cape, it saved Bruce but Dick, who was behind him, was critically wounded.
It explains why Bruce eliminates the cape on the "Batman Beyond" incarnation of the Batsuit, as he'd rather be the one who got shot instead of others. 
The filmmakers intended to create a very mobile Batsuit that would allow the wearer to move easily to fight and crouch.
Previous film incarnations of the Batsuit had been stiff and especially restricted full head movement.
Costume designer Lindy Hemming and her crew worked on the Batsuit at an FX workshop codenamed "Cape Town", a secured compound located at Shepperton Studios in London.
The Batsuit's basic design was a neoprene undersuit, which was shaped by attaching molded cream latex sections.
Christian Bale was molded and sculpted prior to his physical training so the team could work on a full body cast.
To avoid imperfections picked up by sculpting with clay, plastiline was used to smooth the surface.
In addition, the team brewed different mixtures of foam to find the mixture that would be the most flexible, light, durable, and black.
The latter presented a problem, since the process to make the foam black reduced the foam's durability.
For the cape, director Christopher Nolan wanted to have a "flowing cloak... that blows and flows as in so many great graphic novels".
Hemming's team created the cape out of their own version of parachute nylon that had electrostatic flocking, a process shared with the team by the British Ministry of Defence.
The process was used by the London police force to minimize night vision detection.
The cape was topped by a cowl, which was designed by Nolan, Hemming, and costume effects supervisor Graham Churchyard.
The cowl was created to be thin enough to allow motion but thick enough to avoid wrinkling when Bale turned his head in the Batsuit.
Churchyard explained the cowl had been designed to show "a man who has angst", so his character would be revealed through the mask.
The first suits used traditional sewing methods to simply overlap two strips of rubber and sew them together.
In a rubber wetsuit this does not work well for a number of reasons, the main one being that punching holes straight through both layers of foam for the thread opens up passages for water to flow in and out of the suit.
The second problem is that the stretching of the foam tended to enlarge the needle holes when the suit was worn.
This meant that a wetsuit could be very cold all along the seams of the suit.
And although the sewn edge did hold the two pieces together, it could also act as a perforated tear edge, making the suit easier to tear along the seams when putting it on and taking it off.
When nylon-backed neoprene appeared, the problem of the needle weakening the foam was solved, but still the needle holes leaked water along the seams. 
Joel Schumacher's Batman films are known for their addition of rubber nipples to the Batman and Robin costumes (on the DVD commentary, Schumacher claimed they were inspired by statues of the Greek gods), though they are noticeably absent from the secondary suits Batman wears during the climaxes of both films.
In "Batman Forever" (1995), the Batsuit is somewhat similar to the previous two films' costumes, except for the focus on a more anatomical design overall and a black utility belt instead of a yellow one.
The "ears" on the cowl are also longer.
One notable feature of the costume is a button on the utility belt which causes a fireproof coating to excrete from and cover the cape, allowing Batman to wrap it around himself as a shield from extreme fires, and a more 3-D bat emblem on his chest.
Also like in "Batman Returns", Bruce has numerous spares which he keeps in a large dome-like structure in the Batcave of this film.
Dr. Chase Meridian, the film's love interest for Batman, mentions the appeal of Batman's suit as she runs her fingers across the chest section.
After all of the regular Batsuits are destroyed by the Riddler, Bruce is forced to use a prototype "Sonar Suit", which is an iridescent silvery-black and more armor-like.
This new Batsuit utilizes lenses that slide automatically over the cowl's eyeholes to display a sonar-generated image of Batman's surroundings to him, allowing him to see with more accuracy in extreme darkness or glare.
The use of this suit in the climax of the film, allows Batman to smash the Riddler's Box-device and save both Robin and Dr Meridian, which otherwise would have been impossible with the standard Batsuit.
The Batsuits in this film were created from a less dense mixture of foam rubber, which resulted in much lighter suits and allowed more flexibility for Val Kilmer and the various stunt doubles, while increasing durability.
More than 100 Batman and Robin costumes were created to allow for the range of stunts, from underwater scenes to scenes involving fire and extreme fighting.
The basic Batsuit of "Batman Forever" was subsequently used by Christopher Nolan when auditioning actors for the lead role in "Batman Begins", and was worn by Christian Bale and Cillian Murphy among others. 
The rooms and other locations in the building were used in the film "Batman Begins", for the Arkham Asylum scenes.