Are the straws made of silicone?

No, the straw part is a hard plastic, only the top is silicone.

Can you boil the sipper cap for sterilizing?

I don't know about boiling the sipper cap. I do wash it in hot soapy water and use a small brush to scrub it.

Are these for the f400 or f401 models of thermos funtainers?

F401. The F400 tops fit differently and straws are longer.

Do these fit the funtainer f402 bottles?

I don’t know what the f402 is, but they fit the 12 oz funtainer cups.

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Description

🥤 Upgrade your hydration game with leak-proof, eco-smart straws!

SIP SUSTAINABLY - Eco-friendly, BPA-free silicone straws designed for daily use by adults and kids alike.
LEAK PROOF DESIGN - Silicone seals flat to prevent spills—just avoid overtightening the cap for flawless hydration.
EFFORTLESS CLEAN UP - Comes with 3 specialized brushes to keep every sip fresh and hygienic.
CONFIDENCE GUARANTEED - Backed by 100% satisfaction with a full refund policy—because your peace of mind matters.
PERFECT FIT PRECISION - Straws sized at 5.1in length with 8mm outer diameter for seamless Thermos Funtainer compatibility.

The Marbe6pack Replacement Straws set includes 6 BPA-free, soft silicone straws and 3 cleaning brushes, perfectly sized for Thermos Funtainer bottles. Durable, reusable, and safe for both adults and children, these straws ensure a clean, leak-resistant drinking experience backed by a full satisfaction guarantee.

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