Quick answer

For most Astral water shoes and sandals, the techyak-drop-in-recharge-midsole-146891">Techyak Drop-in Recharge Midsole is the easiest way to refresh comfort and support. If you need a full replacement insole with arch support, look for a third-party option that fits your foot shape and activity.

Why Insole Choice Matters for Water Shoes

Astral shoes are built for wet environments, so the insole must handle moisture, quick drying, and grip. A drop-in midsole like the Techyak Drop-in Recharge Midsole adds cushioning without adding bulk, making it ideal for kayaking or SUP where you need a low-profile fit. For sandals, the insole is often integrated, but you can still add a drop-in for extra comfort if the sandal has a removable footbed.

Drop-In vs. Full Replacement Insoles

Drop-in midsoles are thin, flexible inserts that sit under your foot to add cushioning and shock absorption. They work best in shoes that already have a decent footbed. Full replacement insoles are thicker and offer more arch support, but they may not fit well in low-volume water shoes or sandals. For Astral's Loyak AC and PFD Sandals, a drop-in midsole is often the better choice because it preserves the shoe's original fit and drainage.

Fit and Sizing Considerations

When replacing an insole, always check the size compatibility. The Techyak Drop-in Recharge Midsole comes in size M5/W6, so it fits smaller foot sizes. For larger sizes, you may need to trim a full-length insole. Astral shoes tend to run true to size, but if you add a thicker insole, you might need to go up half a size to avoid pressure points. Test the fit with the insole inside the shoe before committing.

Decision rules for choosing an insole

  • Activity type: For paddling and water sports, choose a drop-in midsole that dries quickly and doesn't absorb water. The Techyak Drop-in Recharge Midsole is designed for this purpose. Prioritize quick-drying materials over maximum cushioning.
  • Foot shape and arch: If you have high arches or need extra support, a full replacement insole with arch support may be better. For flat feet, a drop-in midsole with mild cushioning is often enough. Match the insole to your arch type, not just shoe size.
  • Shoe volume: Low-volume shoes like the Loyak AC have limited space. A thick insole can make them too tight. Measure the available depth before buying. Stick to drop-in midsoles for low-volume shoes.

Product facts at a glance

  • Loyak AC: The Loyak AC is an ultra-breathable minimalist water shoe designed for everyday versatility. It features a zero-drop construction and quick-drying performance. Its minimalist design means it has less built-in cushioning, so adding a drop-in midsole can significantly improve comfort without compromising breathability.
  • PFD Sandal M's: The PFD Sandal M's features a stickiest sole for superior grip on wet surfaces and a Zero Drop design for natural foot positioning. The sandal's open design allows for easy insertion of a drop-in midsole if you need extra arch support, but the stickiest sole already provides excellent traction.

Best fit for your needs

Best for

  • Paddlers and water sports enthusiasts who need quick-drying comfort
  • Everyday wear with Astral Loyak AC or PFD Sandals

Not for

  • People with high arches needing firm arch support (choose a full replacement insole instead)
  • Shoes with integrated footbeds that cannot be removed