Eddie by Giddy is a wearable constriction device for erectile dysfunction that works by restricting blood outflow from the penis while allowing blood to flow in. It’s registered as an FDA Class II medical device, and its distinguishing feature is an oval, anatomically shaped design that differs from traditional circular constriction rings.
The Basic Mechanism
An erection depends on blood flowing into the penis and staying there. In many cases of ED, blood flows in normally but leaks back out too quickly through the veins, a problem called venous leak or veno-occlusive dysfunction. Eddie works on the same general principle as any penile constriction band: it applies pressure at the base of the penis to slow venous outflow, helping trap blood and maintain firmness.
What makes Eddie different from a standard circular ring is its shape. The device is oval rather than round, which the manufacturer says better matches the actual cross-sectional anatomy of the penis. A circular ring applies pressure evenly all around, compressing arteries, veins, and the urethra equally. An oval shape is designed to target the veins running along the sides more precisely while putting less pressure on the dorsal artery (which brings blood in) and the urethra (which runs along the bottom). The device also features an open channel on the underside to further reduce compression of the urethra.
Design and Materials
The device has a rigid inner core made of ribbed plastic with a flat top portion, all covered in a soft surgical tubing material. This combination gives it enough structure to maintain consistent pressure while keeping the surface comfortable against skin. The soft outer shell is specifically intended to prevent bruising during use.
Eddie comes with interchangeable tension bands that snap into the device and control how much constriction it provides. These bands vary in resistance, so you can adjust the pressure level. Users in a comparative study noted meaningful differences between band strengths, with medium-resistance bands often providing the best balance between a secure hold and avoiding numbness.
Sizing and Fit
The device comes in four sizes, labeled A through D, which accommodate different penile girths. Size A is the narrowest and D is the widest. Getting the right size matters because a device that’s too large won’t provide enough constriction, while one that’s too tight can cause discomfort or restrict blood flow too aggressively. The company provides a sizing guide to help you measure and select the correct fit before ordering.
Each kit includes the device itself along with multiple tension bands. Between the size options and the different band resistances, there’s a fair amount of adjustability built in. Finding the right combination typically takes some experimentation.
What the Evidence Shows
The clinical evidence behind Eddie is limited. The company references a small trial of 59 men with ED who used the device over 12 weeks and reported improvements in sexual function along with better erection quality and quantity. However, it’s unclear who funded the study, whether the authors were independent of the company, and whether the results were peer-reviewed. No large, independent clinical studies have evaluated the device’s effectiveness.
A randomized survey study published in 2024 compared Eddie by Giddy to another medical-grade constriction device called FirmTech. Of the participants, 53% said they would recommend Eddie, compared to 80% for the competing device. One notable finding: Eddie was felt to improve erectile firmness more in men who actually had ED than in those without, suggesting it may offer more benefit for people with genuine veno-occlusive issues rather than as a general enhancement tool.
User reviews are mixed. Some men report significant improvement in maintaining erections during intercourse, while others find it less effective. This variability is common with constriction devices in general, since ED has many underlying causes and a mechanical device won’t address all of them.
How You Use It
Eddie is placed around the base of the penis, ideally once you’ve already achieved a partial or full erection. The oval shape means it needs to be oriented correctly, with the open channel facing downward along the urethra. You select a tension band beforehand based on how much constriction you want, and the band clips into the device.
Like all constriction bands, Eddie should not be worn for extended periods. The general safety guideline for penile constriction devices is a maximum of 30 minutes of continuous use. Wearing one longer than that risks tissue damage from restricted blood flow. Signs that the device is too tight or has been on too long include numbness, coldness, or skin color changes.
Who It Works Best For
Eddie is most likely to help men whose ED involves difficulty maintaining an erection rather than achieving one in the first place. If the core issue is that blood flows in but doesn’t stay, a constriction device directly addresses that problem. It’s less likely to help if the underlying cause is severely reduced blood inflow, nerve damage, or psychological factors that prevent arousal from starting.
Some men use Eddie alongside other ED treatments like oral medications. The medication helps initiate the erection, and the device helps sustain it. Others use it as a standalone, non-pharmaceutical option, particularly if they prefer to avoid medication side effects or can’t take certain drugs due to other health conditions.