Callaway Epic Flash Sub Zero Driver

Loft Options & Stock Shafts

Technology

Tour Driver

The Epic Flash Sub Zero was Callaway's low-spin driver for 2019, and it's the head better players reached for when the standard Epic Flash spun too much. At 440cc it has a slightly smaller, more compact footprint than the full-size Epic Flash, which is part of what pulls spin down and gives it a more workable look at address. This is the tour version of the Epic Flash family, built for players who deliver enough speed to launch it and enough consistency to not need the biggest, most forgiving head Callaway made that year.

The headline tech was Flash Face, a face design Callaway developed using a machine-learning algorithm they called Cognitive Speed. Instead of a human tweaking the face by hand, software ran through thousands of iterations to find a shape that pushed ball speed higher across the face. Behind it sit the Jailbreak bars, two internal titanium rods connecting the crown and sole that stiffen the body so more energy goes into the ball at impact. Combined, they made this one of the faster faces of its era.

What separates the Sub Zero from its siblings is spin control and adjustability. It has two interchangeable weights in the sole, a heavier 14-gram and a lighter 2-gram, that let you shift the center of gravity to tune spin and launch to your swing. Pair that with the OptiFit hosel for loft and lie changes, and you get a driver you can dial in rather than accept as-is.

• Faster swingers who generate too much spin with standard drivers and lose distance to a ballooning flight
• Mid to low handicappers who want a compact 440cc shape and a neutral face rather than built-in draw bias
• Players who like to tinker and will actually use the movable weight and adjustable hosel to fit their swing
• Anyone chasing a flatter, more penetrating ball flight and willing to give up a little forgiveness to get it

Frequently Asked Questions

What's the difference between the Epic Flash and Epic Flash Sub Zero?

The standard Epic Flash is 460cc with more spin and more forgiveness, and it comes in a version with a draw bias. The Sub Zero is 440cc, lower spinning, and has a neutral face with two movable sole weights. Sub Zero is aimed at faster, more consistent players who need less spin, not more help.

How much can you adjust the spin on the Epic Flash Sub Zero?

The main tool is the two-weight system. There's a heavier 14-gram weight and a lighter 2-gram weight, and you swap which one sits in the forward port versus the back port. Heavy weight forward drops spin for a flatter flight. Heavy weight back adds some spin and forgiveness. The adjustable hosel also changes loft, which shifts spin a little too.

Is the Epic Flash Sub Zero forgiving enough for a mid handicapper?

For a low-spin tour head, it's more forgiving than you'd expect, thanks to Flash Face and Jailbreak keeping ball speed up on off-center hits. But it's still a 440cc low-spin driver. If you struggle to find the center of the face or you need spin to get the ball airborne, the standard Epic Flash will treat you better. Mid handicappers with decent speed and contact can play it.

What is Flash Face technology on the Epic Flash Sub Zero?

Flash Face is a variable-thickness face shape Callaway designed using a machine-learning algorithm rather than by hand. The software ran through thousands of design iterations to find a face that produces faster ball speed across a wider area. It works alongside the Jailbreak bars, which stiffen the head so more energy transfers to the ball at impact.

What loft should I get in the Epic Flash Sub Zero?

It came in 9 and 10.5 degree lofts, and the OptiFit hosel lets you move each up or down by a couple of degrees. Because it's a low-spin head, a lot of players do well going slightly higher on loft than they think, since the head takes spin off. If you swing fast and hit it high, the 9 with the heavy weight forward gives you the flattest, most penetrating flight.