Trying to Conceive?

Sperm are 50% of the equation.

What are you doing to optimize sperm quality?

Sitting Overheats Sperm

Graph showing lower sperm count and decreased motility from testicular overheat.

Introducing The Underdog

The Underdog fertility cooling ice pack in sleeve.

The Underdog Prevents Overheating

Graph showing results of cooling testicles for improving sperm count using Underdog ice pack.


Easy to Use

Small and discreet

Slips easily between the seat and pants

No special underwear required

No wet pants from ice pack condensation

Improve Fertility Naturally

Gentle cooling restores the body's optimal temperature for sperm production

Non-invasive and no-risk

Use in conjunction with IVF to optimize sperm

Soft and Comfortable

Comfortable padded neoprene sleeve

Ergonomic wedge shape

Adapts to all body types

How It Works

Learn how The Underdog optimizes sperm production.

How It Works


Our Mission

Underdog Fertility was founded by three professionals who care deeply about helping others start a family.  

We're on a mission to provide practical tools grounded in science to improve men's reproductive health. 

It's the most important journey of our lives. Let's get started. 

The Underdog is protected by US and international utility patents pending.

Underdog, The Underdog, Underdog Fertility and the Dogface Logo are trademarks of Underdog Fertility. 

Note: The Underdog is a general wellness device, and is not intended for use in the the cure, mitigation, treatment, or prevention of underlying disease or medical conditions.