Mens Gamma MX Jacket-Softshell Jackets-Arc'teryx-Dark Jade-Mountain Sports

Arc'teryx

Men's Gamma MX Jacket

$350.00 Sold Out

Shipping calculated at checkout.

Product variants

Pickup currently unavailable at Arlington, TX

Family-owned since 1972

Free shipping over $150

Free Returns for 30 Days

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Return Policy

Our Promise

At Mountain Sports, we want you to love your new items. If something isn't right, we make it easy (and free!) to return or exchange your purchase within the guidelines below.

Return Eligibility and Timeframe

Returns and exchanges are free for 30 days from the day you receive your order, with the exception of oversized items (see below).
You can choose a refund to your original payment method, an exchange, or store credit.
Items must be unused and in original condition, including all tags, packaging, and accessories.
Please do not use the shoe box or product packaging as the shipping box. Please place it inside a separate shipping carton.

Items That Cannot Be Refunded (Unless Defective)

For everyone's safety and due to industry standards, the following items are not refundable unless they arrive defective:

Climbing gear (harnesses, carabiners, ropes, etc.)
Food items
Water filters
Cut cord/rope
Special order items

If you believe one of these items is defective, contact us so we can review your situation and make it right.

Oversized Items — $40 Flat Return Shipping Fee

Some bulky products (large tents, certain hard goods, oversized equipment, and similar) ship via oversized carriers and are flagged as Oversized Item on the product page before you complete your order. The flat $40 return shipping fee that applies to these items is disclosed at the time of ordering, so you'll know upfront if your item qualifies.

If you later choose to return the item, the $40 return shipping fee will be deducted from your refund or store credit when your return is processed. The returns portal will surface this fee for you again when you start the return, so there are no surprises.

If your oversized item arrived damaged, defective, or as a result of our error, the $40 fee is waived and return shipping is on us. If you're unsure whether your item qualifies as oversized, or you have questions before placing an order or starting a return, please reach out — we'd rather talk it through with you first so you aren’t caught off guard!

How to Start a Return or Exchange

The fastest way to start a return or exchange is right in our returns portal. Enter your order number and zip code, choose the item(s) you'd like to return or exchange, tell us why, and we'll generate a prepaid shipping label for you on the spot.

[Start your return or exchange →]

Prefer to talk to someone? You can also email us at hospitality@mountainsports.com or call (817) 823-0010 and we'll walk you through it.

Shipping Your Return

Standard returns and exchanges include a free prepaid shipping label, generated automatically when you start your return in the portal.
Oversized items include a prepaid label as well, but the $40 flat oversized return shipping fee (disclosed at the time of ordering) will be deducted from your refund or store credit.
Pack your item securely with all tags, accessories, and original packaging included.
Drop the package at the instructed drop off location.
If your return is due to our error or a defective item, shipping is always on us — no exceptions, including no oversized-item fees.

Where to Send Your Return

The prepaid label generated in the returns portal includes the correct shipping address. If you need it for any reason, returns ship to:

Mountain Sports 2025 W. Pioneer Pkwy. Arlington, TX 76013

Refunds and Original Payment Methods

Refunds are issued to your original form of payment unless store credit or exchange are selected.
For oversized items, the $40 flat return shipping fee is deducted from your refund, store credit, or exchange balance.
Once we receive and inspect your return, your refund, exchange, or store credit will be processed as quickly as possible.
You'll get an email confirmation when your refund or exchange has been processed.

Exchanges

Exchanges are easy in the returns portal — pick the size, color, or alternate item you'd like and we'll get it on its way.
If you're unsure what to exchange for, give us a call at (817) 823-0010 and we'll talk through options that fit your needs.
Customers near our Dallas-Fort Worth store are welcome to bring items in for an in-person exchange.

Questions or Need Help?

Our team is here to make your experience as smooth as possible. If you have questions about fit, sizing, oversized status, returns, or exchanges, please reach out before you ship your item back so we can help you choose the best option — call us at (817) 823-0010 or email hospitality@mountainsports.com. We'd genuinely rather hear from you up front than have you guess.

Created for the dynamic demands of alpine travel, the Gamma MX Jacket is a proven performer. Made from our Fortius 2.0 fabric, it provides midweight insulation, resists wind and repels water, breathes, and delivers exceptional durability. Built to handle everything from ice climbing to fall hikes, its articulated patterning and stretch combine for freedom of movement, and the regular fit allows room for light layers.

Features

Weather resistant
Breathable
Lightly insulated
Durable
Hardwearing Fortius™ 2.0 softshell fabric has increased warmth to weight ratio and durability, with wind resistance and a DWR finish
Taped seams for weather resistance, a low-profile finish, and added strength
Shaped cuffs with low profile elasticated cuff at wrist
Regular fit provides freedom of movement
DWR (Durable Water Repellent) finish repels moisture and is free from intentionally added PFAS
Adjustable hem draw cord seals out drafts
Articulated patterning for unrestricted mobility
Two chest pockets with zippers
Two hand pockets with zippers

Materials & Care

Body: Fortius™ 2.0 - 60D Synthetic Stretch Softshell with poly fleece backer, 233gsm, FC0 DWR - 84% Nylon, 16% Elastane 100% Polyester Backing
Care: Machine wash gentle low; Tumble dry permanent press low; Do not bleach; Wash dark colours separately; Do not dry clean; Iron low; Do not use fabric softener; Double rinse.

Size & Fit

Our classic fit is cut comfortably throughout the chest, waist, hip, and thigh. It allows freedom of movement, provides shape, and layers comfortably over or under our layers.
Garment Centre Back Length: Size M is 29"/74cm - Varies by size

Specs

Weight: 510g / 1 lb 2 oz
Fit: Regular
Garment Centre Back Length: Size M is 29"/74cm - Varies by size
Contains materials produced through processes that meet bluesign® criteria
Lining - bluepass Material, recycled content
PFAS (Per- and polyfluoroalkyl substances) Compliant
Body - FC0 DWR, bluepass Material
Country of manufacture: Vietnam
Fair Trade Certified

About The Brand

Born in the Coast Mountains of British Columbia, Arc’teryx designs gear built for the wildest weather and the steepest lines. Every jacket, pack, and layer is engineered for precision and performance — because when conditions get real, your gear should too. At Mountain Sports, we love Arc’teryx for its unmatched craftsmanship and commitment to doing more with less, in nature’s harshest playgrounds.

Arc'teryx Sizing Chart

Measurements are in inches, unless otherwise noted. Charts reflect body measurements, not garment measurements.

Men's Jackets & Shirts:

Size	Sleeve	Chest	Waist	Hip
XXS	30	33	27	32.5
XS	31.5	35	29	34.5
S	32.5	37	31	36.5
M	34	40	34	39.5
L	35	43	37	42.5
XL	36	47	40.5	46.5
XXL	37	51	44.5	50
3XL	38	54.5	48.5	54

Arc'teryx sizes are intended to fit the body measurements above. If your measurements are between sizes, select a larger size for a looser fit or a smaller size for a tighter fit. Arc'teryx has recently updated the men's fit: medium remains unchanged, smaller sizes now fit tighter and larger sizes now fit looser.

Men's Pants & Shorts (Alpha Sizes):

Size	Waist	Hip	Regular Inseam	Short Inseam	Tall Inseam
XXS	27	32.5	31	29	34
XS	29	34.5	31	29	34
S	31	36.5	31.5	29.5	34.5
M	34	39.5	32	30	35
L	37	42.5	32.5	30.5	35.5
XL	40.5	46.5	33	31	36
XXL	44.5	50	33	31	36
XXXL	48.5	54	-	-	-

Men's Pants (Numeric Waist Sizes):

Size	Waist	Hip	Regular Inseam	Short Inseam	Tall Inseam
28	30	35.5	31	29	34
29	31	36.5	31.5	29.5	34.5
30	32	37.5	31.5	29.5	34.5
31	33	38.5	32	30	35
32	34	39.5	32	30	35
33	35	40.5	32	30	35
34	36	41.5	32.5	30.5	35.5
36	38	43.5	33	31	36
38	40	45.5	33	31	36

Numeric pant sizes correspond to the body measurements shown above. Several Arc'teryx pant models are sized numerically and may be offered in Short, Regular, and Tall inseam lengths - see each product page for the options available.

How to measure: Sleeve - with your arm relaxed at your side and slightly bent, measure from the center back of your neck, across the shoulder, over the elbow and down to the wrist. Chest - with arms relaxed at your sides, measure under your arms around the fullest part of your chest. Waist - measure around your waist at the narrowest part. Hip - standing with feet hip width apart, measure around your hips at the widest part. Inseam - from a standing position, measure from your crotch down the inside of your leg to the floor.