Understanding the Relative Wind (and Why It Decides What You Wear)

Newer skydivers tend to think of freefall as falling down. Experienced jumpers think of it differently: you're not really falling so much as sitting in a wind. A 120 mph wind, coming straight at you, the whole time. That wind has a name — the relative wind — and once you understand it, a surprising amount of the sport clicks into place: why you're stable in some body positions and not others, why your fall rate changes when you move, and why your clothing does the strange things it does up there.

Let's break it down, because it's one of those concepts that's genuinely useful to grasp early — and it happens to explain exactly why apparel built for skydiving is built the way it is.

What "relative wind" actually means

When you exit the aircraft and accelerate toward terminal velocity, you reach a speed where the air resistance pushing up on you balances gravity pulling you down. For a belly-to-earth position, that's roughly 120 mph. At that point you're not accelerating anymore — you're falling at a steady rate.

But here's the mental shift: from your body's point of view, you're not moving through still air. You're holding still, and the air is rushing past you — specifically, rushing up at you from below, at 120 mph, because you're falling face-down toward the earth. That oncoming rush of air is the relative wind. It's "relative" because it's defined relative to you and your direction of travel. Change your orientation, and the relative wind comes at you from a different angle.

This isn't an abstraction. It's the single most important physical force you interact with in freefall, and learning to feel it and work with it is a huge part of learning to fly your body.

Why it governs stability

A stable belly-to-earth position works because you present a balanced, symmetrical surface to the relative wind — arms out, legs out, slightly arched. The wind pushes up evenly across your whole front, and you ride on it like a cushion. It's why instructors drill the arch: an arched body is aerodynamically stable in the relative wind, the way a shuttlecock always rights itself.

Break that symmetry — drop an arm, tuck a knee, turn a shoulder — and the relative wind catches the asymmetry and turns or tips you. That's not a malfunction; that's how you steer your body in freefall. Every turn, every move, every formation maneuver is a deliberate manipulation of how your body meets the relative wind. Skilled freefall is essentially a conversation with that wind.

Why it governs fall rate

The relative wind is also why your fall rate changes with body position. Spread out wide — big arch, limbs extended — and you present more surface area to the wind, which slows you down. Get small and streamlined — arms in, legs back — and you present less, so you fall faster. This is how jumpers in a group match fall rates to stay together: a heavier or smaller-framed person spreads out to slow down; a lighter person gets compact to speed up. They're all tuning their surface area against the same relative wind.

And here's why it decides what you wear

Now the part that connects straight to apparel — because your clothing is also a surface that meets the relative wind, whether you designed it to or not.

A regular shirt has an open bottom hem. On the ground, gravity keeps it hanging. In the relative wind, that open hem becomes a scoop: the 120 mph air rushing up at you gets underneath the fabric, inflates the whole torso like a balloon, and shoves it up toward your chest. Now you've got a billowing, flapping shirt bunched around your armpits — extra, uncontrolled surface area meeting the wind in ways you didn't choose. At best it's distracting and looks sloppy on video; at worst the flapping interferes with your handles or your awareness.

Open sleeve cuffs do the same thing on a smaller scale — they catch the wind and balloon, turning your forearms into little unintended drag surfaces.

Apparel built for the relative wind solves this by refusing to give the wind anything to grab:

• A silicon-banded waistband seals the bottom hem against your body, so there's no scoop for the wind to inflate. The shirt stays flat against you instead of ballooning.
• Mesh side panels vent the air that does get in, so pressure can't build up and balloon the torso — the wind passes through instead of inflating.
• A longer cut tucks into your leg straps, anchoring the garment at a second point so it can't ride up.
• Cuff options (elastic or fitted) eliminate sleeve flap for jumpers who don't want it.

In other words, good skydiving apparel is designed with the exact same logic you use to fly your body: control the surfaces that meet the relative wind, eliminate the ones you don't want. A jersey that stays flat and anchored isn't just tidier — it's not adding random drag and distraction to a discipline where you're carefully managing every surface. (We broke down the engineering of this in detail in why regular jerseys fail in freefall.)

Feeling the wind

The best skydivers talk about feeling the relative wind — sensing tiny changes in how it hits them and responding without conscious thought. It takes time and jumps to develop that. But part of getting there is removing noise: the less your gear and clothing are flapping, scooping, and distracting you, the more clearly you can feel the actual air and what your body is doing in it.

That's the quiet argument for apparel built for the sky. It's not about looking good (though it does). It's that clean, anchored apparel gets out of the conversation between you and the relative wind — so the only surfaces talking to the wind are the ones you're deliberately controlling. And that's exactly where you want to be.

Want apparel designed around the relative wind instead of fighting it? See what we build.

Putting it to work: feeling the wind in practice

Understanding the relative wind intellectually is one thing; feeling it is the skill that takes jumps to develop. A few ways the concept shows up in real flying:

The arch is your default for a reason. When in doubt — on exit, recovering from instability, anytime you're unsure — arching presents that balanced, symmetrical surface to the relative wind and lets it stabilize you. Instructors drill it because it's the position the wind naturally wants to keep stable, like a badminton shuttlecock righting itself.

Turns are wind management. To turn in belly flight, you subtly change how one side of your body meets the wind — dropping a shoulder, adjusting an arm. You're not muscling yourself around; you're letting the relative wind do the work by presenting it an asymmetry. Smooth flyers make tiny inputs and let the air respond.

Fall-rate matching is surface-area tuning. When a group needs to stay together, each person adjusts how much surface they present — spreading out to slow down, getting compact to speed up — all against the same relative wind. It's why mixed-size groups can fly together: everyone's tuning their drag.

Tracking is changing the wind's angle. When you "track" — flatten out and move horizontally to gain separation before deployment — you're deliberately changing how your body meets the wind to convert some vertical speed into horizontal travel. It's the relative wind, redirected.

In all of it, the cleaner your profile — body and clothing both — the more precisely you can feel and respond to the wind. Noise from flapping, ballooning fabric muddies that feedback. Quiet, anchored apparel lets the signal through, which is why it's not a coincidence that experienced jumpers tend to fly in gear that simply stays put.