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188.8.131.52 Lunar Boots
The lunar boot (fig. 2-9) is a thermal and abrasion protective device worn over the ITMG and PGA boot assemblies during lunar extravehicular operations. It permits free articulation of the foot and does not restrict mobility of the PGA boot. Donning is accomplished by inserting the PGA boot into the enlarged upper portion of the lunar boot. A donning strap assembly (located at top rear) facilitates positioning of the PGA boot within the lunar boot. The surplus material at the upper front edge folds over to overlap the tongue area and is held closed by engaging a snap fastener and retaining strap attached to each fold. Further security is provided by a strap assembly which extends from each side of the heel and crosses the instep. The strap incorporates a latching mechanism which is easily actuated even while wearing EV gloves.
Table 2-VII defines the material cross section of the lunar boot assembly.
Material Function Teflon-coated Beta cloth Boot liner Aluminized Mylar Insulation film Nomex felt Thermal boot pad Aluminized Mylar (9 layers) Insulation film Nonwoven Dacron (9 layers) Insulation spacer Beta marquisette Kapton laminate (2 layers) Outer insulation Teflon-coated Beta cloth Fire resistant shell High-strength silicone rubber Lunar boot sole Chromel R metal fabric Abrasion, fire, heat resistant