Insulated Pant for Tactical Cold Weather Operations

The Atom Pant LT from the Arc'teryx LEAF series is a high-performance midlayer pant designed for military and law enforcement professionals operating in extreme climatic conditions. It excels through its excellent thermal performance, low weight, and maximum operational efficiency – whether worn alone or integrated into layered clothing systems.

Effective Thermal Protection with Moisture Management

At the core of the insulation is CLIMASHIELD 2oz Combat Fibrefill – a synthetic insulation material treated with DWR. It reliably traps warmth even when damp and dries significantly faster than traditional down. This makes the Atom Pant LT ideal for operations involving high exertion and varying environmental conditions.

The combination of insulation, moisture resistance, and compressibility makes this pant a reliable thermal barrier in both high-mobility and prolonged static scenarios.

Durable Outer Fabrics with Functional Weather Protection

Arc'teryx utilizes a blend of mechanical stretch mini-ripstop nylon and additional technical fabrics such as Pontetorto Hardface Fleece for the outer shell. These materials provide a robust structure with excellent tear and abrasion resistance while maintaining comfort and flexibility.

The Durable Water Repellent (DWR) treatment ensures that moisture beads off the fabric surface, protecting against drizzle, snow contact, and wet terrain. The material effectively blocks wind while maintaining breathability – essential for tactical winter operations.

Full Range of Motion through an Anatomical Fit
The Atom Pant LT is built for dynamic mission profiles: articulated knees and seat areas allow full range of motion during running, kneeling, or climbing. A stretch-adjustable waistband with durable nylon webbing ensures a secure fit and flexible adjustment on the move.

The ergonomic cut fits close to the body without restricting movement – ideal for wearing over a baselayer or under a weather shell. This maintains optimal body climate without creating cold spots or heat build-up.

Field-Ready Features for Rapid Deployment
Full-length side zippers on both legs enable fast donning and doffing, even with boots on. This speeds up transitions and facilitates quick adaptation to temperature shifts. Laminated wind flaps behind the zippers block cold air from entering the garment.

At the leg ends, an elastic snow gaiter seals the pant securely to prevent cold, snow, or moisture from intruding – a key feature in snow, rubble, or icy environments.

Modular Cold Weather System for Tactical Versatility

Weighing only 410 g and featuring a compact pack size, the Atom Pant LT is easy to carry and stow. It functions as a standalone insulating layer or pairs seamlessly with weatherproof pants. Ideal companions include the Atom LT Jacket or Atom LT Hoody, designed for tactical modularity.

An integrated zippered inner pocket provides secure storage for small essentials. The PFAS-compliant material selection reflects Arc'teryx's environmental commitment without compromising tactical performance.

CLIMASHIELD Combat Fibrefill – DWR-treated, moisture-resistant synthetic insulation
Outer Material: TORAY Mini-Ripstop, Pontetorto Hardface Fleece
DWR finish for protection against moisture and snow
Full-length side zippers for rapid donning and doffing with wind flaps
Elastic snow gaiter at leg cuffs
Articulated fit with pre-shaped knees and seat for mobility
Stretch waistband with adjustable nylon webbing
Lightweight: only 410 g
Zippered internal pocket for essentials
PFAS-compliant – environmentally conscious design

Care Instructions:
Machine wash at low temperature
Tumble dry at low heat
Do not bleach
Wash dark colors separately
Do not dry clean
Iron on low setting
Do not use fabric softener
Rinse twice

Mid Layers