Alpha 90 1/2-Zip Mock Neck
Alpha 90 1/2-Zip Mock Neck
Ready to shipShips in 1–3 business days
Ordering ready-to-ship with made-to-order or custom items? We ship everything together once it's all sewn.
Wide: roomier, roughly men's fit. Narrow: trimmer, roughly women's fit.
Our size charts are garment measurements, not body measurements. See the size chart
Weight: 4.2 oz for a Wide Medium. Exact garment weights may vary based on color and batch of fabric used.
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Made in the USA · Free shipping over $130 · 30-day returns on ready-to-ship
Fit & sizing
Fit & sizing
Wide: roomier, roughly men's fit. Narrow: trimmer, roughly women's fit.
Our size charts are garment measurements, not body measurements.

Fabric & care
Fabric & care
Features
Breathable: Allows moisture vapor to escape, keeping the wearer dry.
Lightweight: Provides warmth without added bulk.
Thermal Efficiency: Traps air for insulation in cold conditions.
Quick-Drying: Hydrophobic, moisture-wicking, and fast-drying properties.
Versatile: Ideal for base and mid-layers in cold-weather.
Fabric
Polartec Alpha Direct 90. Our best selling, most versatile midlayer fabric.
What it's good for
Popular with day hikers, runners, and thru-hikers. Warm enough alone, and pairs well with a wind or rain shell for extra warmth.
Care
This is a delicate fabric and must be treated as such! It will snag easily, so keep it away from Velcro, dog claws, and definitely don’t bushwhack in it!
Shipping & returns
Shipping & returns
Ready to ship pieces ship in 1–3 business days. Made-to-order and custom pieces ship once they're sewn, currently in about 8–12 weeks. Orders that mix both ship together.
Free shipping on US orders over $130, and a flat $25 to most other countries.
Unworn ready-to-ship pieces can be returned within 30 days of shipping. Made-to-order returns have a 25% restocking fee, and custom returns 50%. Full returns policy
Made in the USA
Made in the USA
Every Sambob piece is made in the USA. Our made-to-order and custom pieces are sewn by our team of three in Portland, Maine. Everything else is made by small sewing shops on the East Coast.
About 90% of our fabric is made in the USA, including all of our Alpha.

- 5 stars: 9 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 star: 0 (0%)
I wear this 1/2 zip all the time, one of my favorite pieces of gear from SamBob. The fit is true to size, the zipper is smooth and the color is so cool- it changes with what your wearing, reflective like Sea Glass!
Just received my new 1/2 zip mock neck and it is PERFECT! Fits true to size and the Sea Glass color is beautiful. It will be the perfect addition to my layering kit. Thanks SamBob for another great product!
I have a bunch of 1/2 zip turtle necks of different fabrics. This one really stands out for its ability to trap heat and keep you warm. Because it works so well, it's taken some experimenting to find the best combination of layers to avoid being too hot at some temperatures. I have tried wearing it as a top layer at warmer temperatures (60s) if it's not windy and gotten complements on it BUT the sea glass is semi-transparent so you might want to wear a t-shirt under it.
Im totally in love with this mock neck. It is absolutely perfect for a cool night. I recommend it 100%. It looks good to!!!
It's everything I've wanted in a hiking fleece. The material is insanely light and very breathable but still warm, especially when you layer with a wind layer. My only complaint is that I wish it had something to cinch it at the bottom. All in all, it's something I can feel confident throwing in my pack whenever I head out on the trail.
I love this layer! It's warm as soon as you put it on, yet incredibly light. The fit is perfect, and I love the option of having a zip-neck.
What perfect timing you had coming out with a 3/4 zip fleece. I was beginning to think I would have to make my own, and even though I can do it I didn't want to, lol. It has performed very well on my trip to Ireland and then to Greece. Thanks again!
Best mid-layer ever! The combination of warmth at rest, air flow during movement, and feather weight feel on body makes for my new favorite layer heading into fall. I can't recommend it enough! Thank you for the thoughtful touches on the cuffs and true to measurement construction.
Unbelievable how light it is! Soft and warm on your skin. I started with a large but I wanted the fit loose so I got the XL, still weights nothing and I love the green. Sambob was very quick with shipping and received it in time for my next adventure. The weather has been mixed, but if it was cool out I had it on. I gave the large to my sister and she loves the feel and the light weight.