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Original Apollo A7L pressure boot restraint assembly (right foot), with the ILC Industries tag sewn inside, identifying it as "Part No. A7L-106021-18, Serial No. 503, Size 115C," signed on the stiff toe cap in black felt tip by the moonwalker, "Charlie Duke Apollo 16 LMP." The boot is constructed from a blue nylon fabric designed to hold its form under pressure, with convolutes and restraint cables with ferrules that form the ankle mobility joint. It is sewn to a white rubber sole with Velcro patches on the bottom, and at the top is a zipper for joining the boot to the restraint layer's trouser assembly. In fine condition.
The A7L space suit was made of several layers: this boot was part of the blue 'restraint' layer, known as the Torso Limb Suit Assembly (TSLA), which would be sandwiched in between the inflated pressure bladder and the iconic white Integrated Thermal Micrometeoroid Garment (ITMG) outer layer. The TSLA provided structural integrity to the suit by holding the internal suit pressure, and contained the mobility elements that allowed the suit to move—thus permitting the astronauts to walk on the moon.
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