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Arc’teryx Proton vs Atom

Arc’teryx Proton vs Atom: Detailed Comparison Table

Feature	Proton LT	Atom LT	Proton Heavyweight (formerly AR)	Atom Heavyweight (formerly AR)	Proton Lightweight (formerly FL)	Atom SL (soon to be Lightweight)
Insulation	Coreloft Compact 80g/60g	Coreloft Compact 60g	Coreloft 100g/60g	Coreloft Continuous 120g/80g/60g	Octa Loft	Coreloft Compact 40g
Warmth	Moderate to high	Moderate	High	Very high	Moderate	Low to moderate
Breathability	High	Moderate	High	Low to moderate	High	Moderate
Weather Resistance	DWR coating, highly resistant	DWR coating, resistant	DWR coating, highly resistant	DWR coating, resistant	DWR coating, moderate resistance	DWR coating, moderate resistance
Weight	14.5 oz (men’s large)	13.2 oz (men’s medium)	19.4 oz (men’s large)	17.1 oz (men’s medium)	11.4 oz (men’s medium)	9.5 oz (men’s medium)
Packability	Moderate	High, compresses into pocket	Moderate	High, compressible	High, good balance	Very high, highly packable
Activity Type	High-output activities	General outdoor and casual wear	High-output activities in cold	Low-activity or static in cold	High-output activities	Mild conditions, lightweight mid-layer
Fit	Athletic, longer length	Trim, shorter length	Athletic, longer length	Regular fit	Athletic, trim fit	Trim fit, sleek design
Hood	Adjustable, helmet compatible	Adjustable, helmet compatible	Adjustable, helmet compatible	Adjustable, helmet compatible	Adjustable, helmet compatible	Adjustable, helmet compatible
Pockets	Two zippered hand, one internal chest	Two zippered hand, one internal chest	Two zippered hand, one internal chest	Two zippered hand, one internal chest	Two zippered hand	Two zippered hand
Cuffs and Hem	Stretch-knit cuffs, adjustable hem	Stretch-knit cuffs, adjustable hem	Stretch-knit cuffs, adjustable hem	Stretch-knit cuffs, adjustable hem	Stretch-knit cuffs, adjustable hem	Stretch-knit cuffs, adjustable hem
Unique Features	Dual back flaps, longer length	Dope-dyed lining, slimmer fit	Dual back flaps, longer length	Dope-dyed lining, dropped hem	Durable shell fabric	Fleece side panels for mobility

Comprehensive Comparison Table for Arc’teryx Proton vs. Atom Jackets

Feature	Atom LT (Men’s – Women’s)	Atom Heavyweight (formerly AR) (Men’s – Women’s)	Atom SL (soon to be Lightweight) (Men’s – Women’s)	Proton LT (Men’s – Women’s)	Proton Heavyweight (formerly AR) (Men’s – Women’s)	Proton Lightweight (formerly FL) (Men’s – Women’s)
Estimated Temp (F/C)	43/6	18/-8	52/11	37/3	21/-6	48/9
Breathability	9/10	4/10	10/10	7/10	6/10	8/10
Wind Resistance	6/10	8/10	2/10	7/10	7/10	4/10
Abrasion Resistance	7/10	8/10	7/10	8/10	10/10	7/10
Pit Venting	Yes, mesh	Yes, mesh	Yes, mesh	No	No	No
Two Way Zipper	No	No	No	No	No	No
Stuffs into Itself	No	No	No	No	No	No
Synthetic Fill	Coreloft Continuous	Coreloft Continuous	Coreloft Compact	Coreloft Compact	Coreloft	Octa Loft
Fill Weight	60 g/m²	120 g/m² + 80 g/m² + 60 g/m²	40 g/m²	80 g/m² + 60 g/m²	100 g/m² + 60 g/m²	94 g/m²
Face Fabric	20D Tyono	30D Tyono	20D Tyono	Fortius Air 20	Fortius Air 50	Fortius Air 20
Primary Activity	All Round	All Round	All Round	Climbing	All Round	Climbing
Fit	Trim	Regular	Trim	Trim	Regular	Trim
Weight	375 g / 13.2 oz	475 g / 1 lb	270 g / 9.5 oz	375 g / 13.2 oz	540 g / 1 lb 3 oz	343 g / 12.1 oz
Length (CB)	74 cm / 29.1 in	74 cm / 29.1 in	72 cm / 28.3 in	75 cm / 29.4 in	77 cm / 30.5 in	75 cm / 29.5 in
Internal Pockets	1x chest	1x chest	None	None	2x dump	None
External Pockets	2x zippered hand pockets	2x zippered hand pockets	2x zippered hand pockets	1x chest	2x zippered hand, 2x chest	1x chest

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