The IRC MK-50 Compression Suit is designed to allow crew members to work and survive in low-pressure environments. Dallas, Lambert and Kane wore compression suits onboard The Derelict on Acheron LV-426. The helmet appears to be non-resistant to Xenomorphs, as seen in Alien when the facehugger broke through the helmet's plastic and attached itself to Kane.
For low pressure operations, one of the most commonly used suits in service is the IRC Mk. 50 Compression Suit. The suit consists of an inner thermal regulation garment and two outer layers of tight fitting elastic fabric with an airtight covering to compress the wearer's body against the effects of low pressure. No decompression period is required before donning the suit, and they provide greater freedom of movement than a pressure suit. Furthermore, without the need to maintain suit pressure, less breathable gas needs to be carried and life support packs can be considerably lighter. However, the suits take longer to put on than pressure suits, are less comfortable over long durations and provide no protection against high pressures.