Alien Gear Holsters
ShapeShift® 4.0 IWB Expansion Pack for Sig Sauer Handguns
ShapeShift® 4.0 IWB Expansion Pack for Sig Sauer Handguns
SKU:SSEPIW-0925-RH
4.52 / 5.0
(2626) 2626 total reviews
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NOTE: This product is not a full holster; it requires a ShapeShift® shell to operate. The ShapeShift® 4.0 IWB Holster base for current owners of a ShapeShift® Holster.
Features
Features
Specifications
Specifications
Weight: 4.6 oz
Dimensions: 9.25in x 8.25in x 0.75in
Materials: TPE, Neoprene
Fitment Info
Fitment Info
This expansion pack is ordered by firearm to determine the base size needed and to ensure proper combat grip.
User Guide
User Guide
Shipping & Returns
Shipping & Returns
Shipping Information
Our standard shipping time within the continental United States is 4-8 business days. We offer expedited shipping with FedEx 2nd Day Air. The standard build times still apply.
Return Policy
Please click here for the most up-to-date return information.
Warranty
Warranty
Alien Gear Holsters – Limited Warranty Policy
Warranty Coverage
Alien Gear Holsters warrants that its products are free from defects in materials and workmanship under normal and intended use for the following periods from the original date of purchase:
- Injection-Molded Holsters (including Photon, select ShapeShift products and accessories): 5-Year Limited Warranty
- Rapid Force Holsters and accessories and sewn components for Cloak, ShapeShift, GripTuck and Low Pro (including straps and soft goods): 3-Year Limited Warranty
This warranty applies only to products purchased through Alien Gear Holsters or an authorized dealer/distributor and is valid for the original end user.
If you believe this product has any defects in materials or workmanship, cease use immediately and contact customer service for a remedy.
For approved claims, Alien Gear Holsters will, at its discretion:
- Repair the product, or
- Replace the defective product or component, or
- Provide a functionally equivalent product if the original is discontinued, or
- Provide an alternative resolution in cases where there is no repair or replacement option
What Is Not Covered
This warranty does not cover:
- Normal wear and tear (including cosmetic wear, finish wear or retention changes from repeated draw use)
- Damage resulting from misuse, abuse, negligence or use outside intended application
- Improper installation, modification or unauthorized repair
- Damage caused by under or over-tightening hardware or use of non-approved accessories
- Lack of proper maintenance of the holster and accessories
- Products that have been altered from their original configuration
- Lost or stolen items
Duty and professional use (law enforcement, military, training environments) are considered intended use and are covered under this warranty. However, damage resulting from extreme or atypical conditions outside normal operational use may be excluded.
Authorized Sales Channels
This warranty is valid only for products purchased through:
- Alien Gear Holsters (direct)
- Authorized dealers and distributors
Products purchased through unauthorized resellers, secondary marketplaces or private-party sales are not covered under this warranty.
Proof of Purchase
To initiate a warranty claim, one of the following is required:
- Original proof of purchase (receipt or order confirmation), or
- Verification through dealer/distributor order records, or
- Agency-issued equipment verification (for law enforcement or military personnel)
Warranty Claim Process
To submit a claim, contact:
support@aliengearholsters.com
208-215-2046
Customers must provide:
- Description of the issue
- Photographic evidence of the defect
- Proof of purchase or verification
Alien Gear Holsters reserves the right to inspect, verify and validate all warranty claims prior to approval. All returns must be authorized in advance through an issued RMA. Any product returned without proper authorization may be refused, returned at the sender's expense or disposed of at Alien Gear Holsters' discretion.
Shipping Responsibility
-
Domestic (U.S.):
- Customer is responsible for inbound shipping unless otherwise approved
- Alien Gear Holsters will cover outbound shipping for approved warranty replacements
-
International:
- Customer is responsible for all shipping costs, duties and taxes
- In certain cases, Alien Gear Holsters may offer alternative solutions (e.g., replacement without return, partial credit) when return shipping is not practical
Limitations
- This warranty is limited to repair or replacement of the product only
- Alien Gear Holsters is not liable for incidental or consequential damages
THE COMPANY MAKES NO OTHER WARRANTIES EXPRESS, IMPLIED, OR STATUTORY INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY. IN NO EVENT SHALL THE COMPANY BE LIABLE FOR ANY PUNITIVE, EXEMPLARY, OR CONSEQUENTIAL DAMAGES, ANTICIPATED OR LOST PROFITS, INCIDENTAL DAMAGES, LOSS OF TIME, OR OTHER INDIRECT LOSSES OR EXPENSES THAT ARISE FROM ANY CAUSE RELATING TO THE PRODUCT, REGARDLESS OF THE FORM OF THE ACTION, WHETHER IN TORT (INCLUDING NEGLIGENCE), CONTRACT, STRICT LIABILITY OR OTHERWISE, AND REGARDLESS OF WHETHER THE COMPANY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH CONSEQUENTIAL DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE.
Made in the USA
Made in the USA
100% Made in America. Located, engineered, manufactured, shipped and services from North Idaho.
International Dealers
International Dealers
View our International Dealers
Share

- 5 stars: 2021 (77%)
- 4 stars: 254 (10%)
- 3 stars: 153 (6%)
- 2 stars: 84 (3%)
- 1 star: 114 (4%)
Great holster for carrying a full size pistol comfortably and securely. It's adjustable for ride height and cant as well. It also keeps gun from printing much.
Just bought the 4.0 Glock 43x non- mos shapeshifter! Very comfortable even when it’s hot out. Love it and if it ever wears out I’ll buy another one ! Awesome Product!!!
I contacted you via e-mail and you didn't pay attention to me, my gun didn't help at all
Using this holster for my Glock 19 gen4 for months, solid materials, very comfortable, great fit. I will recommend this product.
Excellent Experience from the start of my purchase to finish. I am a beginner, my customer service experience was like none other. She was friendly, professional and knowledgeable. She ask a lot of question about my firearm however when she was done she knew exactly what I needed. I received my purchase within 3 day. And i am very happy with my purchase.
Wanted to try different combinations with this to see if I liked a full shell or a half shell setup but they send it assembled and I'm pretty sure they use super glue because I've done everything besides cutting this mount on top of the shell off so I could try a full shell instead of the half shell. Instructions are as clear as mud and the only video I can find isn't much better. If I knew I'd be stuck with only having 1 configuration I'd just went with a we the people holster in the first place. For $85 I could have gotten alot more from a different company. Pretty let down and won't recommend anyone to use these holsters. Maybe try sending them disassembled so users can actually customize the holster instead of being stuck with a bonded together holster not in the configuration I want. Also because that mount can't be took off I'm unable to adjust the cant of this holster because the top screw won't come out unless that mount is off. The trigger guard i can take off with 1 hand.
I just have a question I have an xdm E 45 with a defender red dot and a tlr-6 flashlight attached to it will this holster fit my fit my gun with the attachments on it?
I'm a big guy, and these are some of the more comfortable holsters (for me) - I liked them so much, I own 3 of them, for each of my carry guns I've had over the last few years. Sadly, I can't use it with my current EDC, as it doesn't support my light... Otherwise, 5 freakin' stars!
It wasn’t as comfortable as I thought it would be. For ME a regular holster is more comfortable. ShapeShift actually makes it feel a lot bulkier and hotter.
I’m sorry to hear the ShapeShift 4.0 IWB Holster wasn’t as comfortable for you as you expected. Comfort can vary quite a bit depending on body type, carry position, and personal preference, and some Customers do prefer a more traditional holster with less material against the body.
If you decide the ShapeShift 4.0 isn’t the right fit for you, you can start a return through our Return Portal here:
https://alien-gear-holsters.loopreturns.com/#/
We appreciate you giving it a try and sharing your experience with us.
Works great the second time I bought it for my .9 mm Smith & Wesson.
Haven't had a chance to use this particular holster yet, but have several Alien Gear holsters and love them all. I'm sure this one will be the same!
I dont like the fit of the holster and feel that it isnt secure as it is only attached to the backing pad on one side.
Thank you for taking the time to leave your feedback.
The ShapeShift® 4.0 IWB Holster is intentionally designed with a single mounting point. This allows the steel-reinforced holster base to flex and conform to your side, enhancing comfort, reducing printing, and improving concealability while still providing full trigger guard protection and structural support.
The holster also features adjustable cant and ride height so you can fine-tune the fit to your personal preference. You can find adjustment instructions in the User Guide here:
If the ShapeShift® 4.0 IWB Holster isn't the right fit for your needs and you're still within our 30-Day Test Drive period, you can start a return or exchange by visiting:
https://alien-gear-holsters.loopreturns.com/#/
Simply enter your AGH order number and email address, then follow the prompts to complete your return or exchange request.
We appreciate your feedback, as we understand holster fit and comfort are personal preferences, and your comments help us continue improving our products.
Very good quality and comfortable for daily use.
Ive been waiting for yall to come out with this for the ruger 57 for years when r yall goin to do it also what happened to the seat strap holster
Thank you for your review!
Good news—we've actually offered holsters for the Ruger-57 for several years now! You can view all of the currently available options by searching for your firearm at: https://aliengearholsters.com/pages/product-search?q=ruger%2057
As for the ShapeShift Seat Strap Holster, that product was discontinued several years ago based on Customer feedback and demand. We always appreciate hearing what our Customers are looking for, as it helps guide future product decisions.
Thanks again for reaching out, and we appreciate your interest in our products!
The ShapeShift 4.0 IWB is very comfortable to wear even before you get used to it. However the belt clips are a little stiff and that makes adjusting the position of the holster a little difficult. Other than that, I have no complaints at all. I wish that, I would've purchased the ShapeShift 4.0 sooner.
Not sure if the retention is made correctly for my hellcat pro but the 4.0 is the best than the down graded one
Great holster 4 one I have gotten
Fits great. Comfortable. Wore for over 8 hours.
I love this holster, best one Ive purchases that fits well and feels comfortable.
Fits my gun well and is very comfortable! Because its a modular type, it is a little thicker than some others, But I don't mind that because of the extra functionality.
Absolutely amazing and now my favorite carry holster and positioning by far.
good
Extremely comfortable, hides my full sized Arm well. Very adjustable, can move the clips up or down for deep concealment. Plus it almost entirely covers the Beavertail that juts out under the hammer, which is a huge plus and the reason i wanted this holster. 10/10, will buy Holsters from Alien Gear from now on!
I was sent the wrong holster
We emailed you in regards to this and apologize for the oversight. Please check your inbox and then we can advise accordingly.